Unframe chrome://extensions as it's the last (and only) uber item

chrome/browser/browser_about_handler.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/browser_about_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 53 matching lines @@
   // Legacy redirect from chrome://history-frame to chrome://history.
   if (host == chrome::kDeprecatedChromeUIHistoryFrameHost)
     host = chrome::kChromeUIHistoryHost;
 
   // Replace cache with view-http-cache.
   if (host == chrome::kChromeUICacheHost) {
     host = content::kChromeUINetworkViewCacheHost;
   // Replace sync with sync-internals (for legacy reasons).
   } else if (host == chrome::kChromeUISyncHost) {
     host = chrome::kChromeUISyncInternalsHost;
-  // Redirect chrome://extensions.
+// Redirect chrome://extensions, chrome://extensions-frame, and
+// chrome://settings/extensions all to chrome://extensions and forward path.
 #if BUILDFLAG(ENABLE_EXTENSIONS)
-  } else if (host == chrome::kChromeUIExtensionsHost) {
-    // If the material design extensions page is enabled, it gets its own host.
-    // Otherwise, it's handled by the uber settings page.
-    if (base::FeatureList::IsEnabled(features::kMaterialDesignExtensions)) {
-      host = chrome::kChromeUIExtensionsHost;
-      path = url->path();
-    } else {
-      host = chrome::kChromeUIUberHost;
-      path = chrome::kChromeUIExtensionsHost + url->path();
-    }
-  // Redirect chrome://settings/extensions (legacy URL).
-  } else if (host == chrome::kChromeUISettingsHost &&
-             url->path() ==
-                 std::string("/") + chrome::kDeprecatedExtensionsSubPage) {
-    host = chrome::kChromeUIUberHost;
-    path = chrome::kChromeUIExtensionsHost;
+  } else if (host == chrome::kChromeUIExtensionsHost ||
+             host == chrome::kChromeUIExtensionsFrameHost ||
+             (host == chrome::kChromeUISettingsHost &&
+              url->path() ==
+                  std::string("/") + chrome::kDeprecatedExtensionsSubPage)) {
+    host = chrome::kChromeUIExtensionsHost;
+    path = url->path();
 #endif  // BUILDFLAG(ENABLE_EXTENSIONS)
   } else if (host == chrome::kChromeUIHistoryHost) {
     // Redirect chrome://history.
     path = url->path();
   }
 
   GURL::Replacements replacements;
   replacements.SetHostStr(host);
   if (!path.empty())
     replacements.SetPathStr(path);
@@ skipping 14 matching lines @@
     return true;
   }
   if (base::LowerCaseEqualsASCII(spec, chrome::kChromeUIQuitURL)) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::BindOnce(&chrome::AttemptExit));
     return true;
   }
 
   return false;
 }