Remove obsolete NotFatalUntil in BrowserCoordinator

Original issue was fixed by https://crrev.com/c/1157772 and verified in
M133. Replace DWC with `CHECK` to be alerted for future issues.

Change-Id: I9a67767edc0d498dd9232ae985f2344a904209d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6235826
Auto-Submit: Ginny Huang <ginnyhuang@chromium.org>
Reviewed-by: Federica Germinario <fedegermi@google.com>
Commit-Queue: Federica Germinario <fedegermi@google.com>
Cr-Commit-Position: refs/heads/main@{#1416658}
NOKEYCHECK=True
GitOrigin-RevId: 11ceefd9b0cb149e11d367dc16d056fb6e166340
diff --git a/chrome/browser/browser_view/ui_bundled/browser_coordinator.mm b/chrome/browser/browser_view/ui_bundled/browser_coordinator.mm
index 347138a..f5164a0 100644
--- a/chrome/browser/browser_view/ui_bundled/browser_coordinator.mm
+++ b/chrome/browser/browser_view/ui_bundled/browser_coordinator.mm
@@ -2308,11 +2308,7 @@
 #pragma mark - BrowserViewVisibilityConsumer
 
 - (void)browserViewDidChangeVisibility {
-  // TODO(crbug.com/377763682): This is a temporary fix to avoid a crash.
-  if (!self.browser) {
-    NOTREACHED(base::NotFatalUntil::M133);
-    return;
-  }
+  CHECK(self.browser);
   raw_ptr<TabBasedIPHBrowserAgent> tabBasedIPHBrowserAgent =
       TabBasedIPHBrowserAgent::FromBrowser(self.browser);
   if (!tabBasedIPHBrowserAgent) {