Revert "[Browser Layout] Switch to new frame layout API by default"

This reverts commit d031210359bc83e34633a9ec8ebf8fbd44687b69.

Reason for revert: Broke some tests, example failures https://ci.chromium.org/ui/p/chrome/builders/ci/linux-chromeos-chrome/54040/overview

Original change's description:
> [Browser Layout] Switch to new frame layout API by default
>
> This CL:
>  - Makes the "use new layout" feature into an always-on killswitch
>  - Renames BrowserViewLayoutDelegateImplNew to
>    BrowserViewLayoutDelegateImpl
>  - Removes references to the feature flag elsewhere
>
> The effect will be that in addition to the flag being on for all CQ
> testbots and ToT builds, it will also be on for Canary, Dev, and CI
> bots.
>
> This should allow us to collect error reports from more users and
> determine if there are any issues with the new logic.
>
> Bug: 443123625
> Change-Id: Id2d7f6818ed1aba1ed8842b24275e0e7dfe0488e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7011507
> Commit-Queue: Dana Fried <dfried@chromium.org>
> Reviewed-by: Darryl James <dljames@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1525685}

Bug: 443123625
Change-Id: Ic93ddf8fb9b49299ed8504ef4b75163db23e0d99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7016627
Auto-Submit: Ivan Šandrk <isandrk@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Ivan Šandrk <isandrk@chromium.org>
Commit-Queue: Ivan Šandrk <isandrk@chromium.org>
Owners-Override: Ivan Šandrk <isandrk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1526174}
diff --git a/chrome/browser/ui/ui_features.cc b/chrome/browser/ui/ui_features.cc
index 55a439d0..1e594bb5 100644
--- a/chrome/browser/ui/ui_features.cc
+++ b/chrome/browser/ui/ui_features.cc
@@ -44,6 +44,12 @@
 BASE_FEATURE(kFewerUpdateConfirmations, base::FEATURE_ENABLED_BY_DEFAULT);
 #endif
 
+#if !BUILDFLAG(IS_ANDROID)
+BASE_FEATURE(kDesktopNewTopAreaLayoutFeature,
+             "DesktopNewTopAreaLayout",
+             base::FEATURE_DISABLED_BY_DEFAULT);
+#endif
+
 #if BUILDFLAG(ENABLE_EXTENSIONS)
 
 BASE_FEATURE(kExtensionsCollapseMainMenu, base::FEATURE_DISABLED_BY_DEFAULT);
diff --git a/chrome/browser/ui/ui_features.h b/chrome/browser/ui/ui_features.h
index 5ba42f8..3c4c8cc0 100644
--- a/chrome/browser/ui/ui_features.h
+++ b/chrome/browser/ui/ui_features.h
@@ -34,6 +34,11 @@
 BASE_DECLARE_FEATURE(kFewerUpdateConfirmations);
 #endif
 
+#if !BUILDFLAG(IS_ANDROID)
+// Feature that manages the transition between old and new browser layout.
+BASE_DECLARE_FEATURE(kDesktopNewTopAreaLayoutFeature);
+#endif
+
 #if BUILDFLAG(ENABLE_EXTENSIONS)
 
 // Controls how extensions show up in the main menu. When enabled, if the
diff --git a/chrome/browser/ui/views/frame/browser_view.h b/chrome/browser/ui/views/frame/browser_view.h
index 37972c8..9cacfda 100644
--- a/chrome/browser/ui/views/frame/browser_view.h
+++ b/chrome/browser/ui/views/frame/browser_view.h
@@ -886,7 +886,7 @@
  private:
   // Do not friend BrowserViewLayout. Use the BrowserViewLayoutDelegate
   // interface to keep these two classes decoupled and testable.
-  friend class BrowserViewLayoutDelegateImpl;
+  friend class BrowserViewLayoutDelegateImplNew;
   friend class BrowserViewLayoutDelegateImplOld;
   friend class BrowserViewLayoutDelegateImplBrowsertest;
   friend class TopControlsSlideControllerTest;
diff --git a/chrome/browser/ui/views/frame/browser_view_layout_delegate_impl.cc b/chrome/browser/ui/views/frame/browser_view_layout_delegate_impl.cc
index 74e1638..96f32b6d 100644
--- a/chrome/browser/ui/views/frame/browser_view_layout_delegate_impl.cc
+++ b/chrome/browser/ui/views/frame/browser_view_layout_delegate_impl.cc
@@ -20,19 +20,11 @@
 #include "ui/gfx/geometry/rect.h"
 #include "ui/views/view.h"
 
-namespace {
-
-// Feature that manages the transition between old and current browser layout
-// delegate. This feature is on by default and provided only as a killswitch.
-BASE_FEATURE(kDesktopNewTopAreaLayoutFeature, base::FEATURE_ENABLED_BY_DEFAULT);
-
-}  // namespace
-
 // static
 std::unique_ptr<BrowserViewLayoutDelegate>
 BrowserViewLayoutDelegateImplBase::CreateDelegate(BrowserView& browser_view) {
-  if (base::FeatureList::IsEnabled(kDesktopNewTopAreaLayoutFeature)) {
-    return std::make_unique<BrowserViewLayoutDelegateImpl>(browser_view);
+  if (base::FeatureList::IsEnabled(features::kDesktopNewTopAreaLayoutFeature)) {
+    return std::make_unique<BrowserViewLayoutDelegateImplNew>(browser_view);
   }
   return std::make_unique<BrowserViewLayoutDelegateImplOld>(browser_view);
 }
@@ -233,13 +225,14 @@
   return gfx::ToEnclosingRect(bounds_f);
 }
 
-BrowserViewLayoutDelegateImpl::BrowserViewLayoutDelegateImpl(
+BrowserViewLayoutDelegateImplNew::BrowserViewLayoutDelegateImplNew(
     BrowserView& browser_view)
     : BrowserViewLayoutDelegateImplBase(browser_view) {}
-BrowserViewLayoutDelegateImpl::~BrowserViewLayoutDelegateImpl() = default;
+BrowserViewLayoutDelegateImplNew::~BrowserViewLayoutDelegateImplNew() = default;
 
 gfx::Rect
-BrowserViewLayoutDelegateImpl::GetBoundsForTabStripRegionInBrowserView() const {
+BrowserViewLayoutDelegateImplNew::GetBoundsForTabStripRegionInBrowserView()
+    const {
   const gfx::Size tabstrip_minimum_size =
       browser_view().tab_strip_view()->GetMinimumSize();
   const auto layout = GetFrameView()->GetBrowserLayoutParams();
@@ -267,7 +260,7 @@
 }
 
 gfx::Rect
-BrowserViewLayoutDelegateImpl::GetBoundsForToolbarInVerticalTabBrowserView()
+BrowserViewLayoutDelegateImplNew::GetBoundsForToolbarInVerticalTabBrowserView()
     const {
   const gfx::Size toolbar_preferred_size =
       browser_view().toolbar()->GetPreferredSize();
@@ -293,7 +286,7 @@
 }
 
 gfx::Rect
-BrowserViewLayoutDelegateImpl::GetBoundsForWebAppFrameToolbarInBrowserView()
+BrowserViewLayoutDelegateImplNew::GetBoundsForWebAppFrameToolbarInBrowserView()
     const {
   if (!GetFrameView()->ShouldShowWebAppFrameToolbar()) {
     return gfx::Rect();
diff --git a/chrome/browser/ui/views/frame/browser_view_layout_delegate_impl.h b/chrome/browser/ui/views/frame/browser_view_layout_delegate_impl.h
index 7024047..8aa7c4c3 100644
--- a/chrome/browser/ui/views/frame/browser_view_layout_delegate_impl.h
+++ b/chrome/browser/ui/views/frame/browser_view_layout_delegate_impl.h
@@ -77,10 +77,11 @@
 
 // The new implementation of the layout delegate; uses new BrowserLayoutParams
 // API.
-class BrowserViewLayoutDelegateImpl : public BrowserViewLayoutDelegateImplBase {
+class BrowserViewLayoutDelegateImplNew
+    : public BrowserViewLayoutDelegateImplBase {
  public:
-  explicit BrowserViewLayoutDelegateImpl(BrowserView& browser_view);
-  ~BrowserViewLayoutDelegateImpl() override;
+  explicit BrowserViewLayoutDelegateImplNew(BrowserView& browser_view);
+  ~BrowserViewLayoutDelegateImplNew() override;
 
   gfx::Rect GetBoundsForTabStripRegionInBrowserView() const override;
   gfx::Rect GetBoundsForToolbarInVerticalTabBrowserView() const override;
diff --git a/chrome/browser/ui/views/frame/browser_view_layout_delegate_impl_browsertest.cc b/chrome/browser/ui/views/frame/browser_view_layout_delegate_impl_browsertest.cc
index 1086bc2..7610dabe 100644
--- a/chrome/browser/ui/views/frame/browser_view_layout_delegate_impl_browsertest.cc
+++ b/chrome/browser/ui/views/frame/browser_view_layout_delegate_impl_browsertest.cc
@@ -157,7 +157,7 @@
     auto* const layout = browser_view->GetBrowserViewLayout();
     if (use_new_delegate) {
       layout->SetDelegateForTesting(
-          std::make_unique<BrowserViewLayoutDelegateImpl>(*browser_view));
+          std::make_unique<BrowserViewLayoutDelegateImplNew>(*browser_view));
     } else {
       layout->SetDelegateForTesting(
           std::make_unique<BrowserViewLayoutDelegateImplOld>(*browser_view));
diff --git a/testing/variations/fieldtrial_testing_config.json b/testing/variations/fieldtrial_testing_config.json
index 78da6ba..419e86c1 100644
--- a/testing/variations/fieldtrial_testing_config.json
+++ b/testing/variations/fieldtrial_testing_config.json
@@ -8488,6 +8488,24 @@
             ]
         }
     ],
+    "DesktopNewTopAreaLayout": [
+        {
+            "platforms": [
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "DesktopNewTopAreaLayout"
+                    ]
+                }
+            ]
+        }
+    ],
     "DesktopNtpDriveCache": [
         {
             "platforms": [