Prefetch: Enable PrefetchServiceWorker by default

Bug: 40947546, 420310104
Change-Id: I2ca9ce6695de03f530fc7f6a58454912936ffcee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6786519
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1492557}

content/browser/preloading/prefetch/prefetch_features.cc

diff --git a/content/browser/preloading/prefetch/prefetch_features.cc b/content/browser/preloading/prefetch/prefetch_features.cc
index d1b5141..469c59e 100644
--- a/content/browser/preloading/prefetch/prefetch_features.cc
+++ b/content/browser/preloading/prefetch/prefetch_features.cc
@@ -64,7 +64,7 @@
 
 BASE_FEATURE(kPrefetchServiceWorker,
              "PrefetchServiceWorker",
-             base::FEATURE_DISABLED_BY_DEFAULT);
+             base::FEATURE_ENABLED_BY_DEFAULT);
 
 bool IsPrefetchServiceWorkerEnabled(content::BrowserContext* browser_context) {
   return base::FeatureList::IsEnabled(kPrefetchServiceWorker) &&

testing/variations/fieldtrial_testing_config.json

diff --git a/testing/variations/fieldtrial_testing_config.json b/testing/variations/fieldtrial_testing_config.json
index a039f361..7dbc7f1a 100644
--- a/testing/variations/fieldtrial_testing_config.json
+++ b/testing/variations/fieldtrial_testing_config.json
@@ -18038,26 +18038,6 @@
             ]
         }
     ],
-    "PrefetchServiceWorker": [
-        {
-            "platforms": [
-                "android",
-                "android_webview",
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "PrefetchServiceWorker"
-                    ]
-                }
-            ]
-        }
-    ],
     "PrefetchServiceWorkerNoFetchHandlerFix": [
         {
             "platforms": [