Change the URL for the Extension Settings page from chrome://settings/extensionSettings to chrome...

chrome/browser/browser_about_handler.cc

 // Copyright (c) 2011 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 <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 1501 matching lines @@
   // Only handle chrome://foo/, URLFixerUpper::FixupURL translates about:foo.
   // TAB_CONTENTS_WEB handles about:blank, which frames are allowed to access.
   if (!url->SchemeIs(chrome::kChromeUIScheme))
     return false;
 
   // Circumvent processing URLs that the renderer process will handle.
   if (chrome_about_handler::WillHandle(*url))
     return false;
 
   std::string host(url->host());
+  std::string path;
   // Replace about with chrome-urls.
   if (host == chrome::kChromeUIAboutHost)
     host = chrome::kChromeUIChromeURLsHost;
   // Replace cache with view-http-cache.
-  if (host == chrome::kChromeUICacheHost)
+  if (host == chrome::kChromeUICacheHost) {
     host = chrome::kChromeUINetworkViewCacheHost;
   // Replace gpu with gpu-internals.
-  else if (host == chrome::kChromeUIGpuHost)
+  } else if (host == chrome::kChromeUIGpuHost) {
     host = chrome::kChromeUIGpuInternalsHost;
   // Replace sync with sync-internals (for legacy reasons).
-  else if (host == chrome::kChromeUISyncHost)
+  } else if (host == chrome::kChromeUISyncHost) {
     host = chrome::kChromeUISyncInternalsHost;
+  // Redirect chrome://extensions to chrome://settings/extensions.
+  } else if (host == chrome::kChromeUIExtensionsHost) {
+    host = chrome::kChromeUISettingsHost;
+    path = chrome::kExtensionsSubPage;
+  }
   GURL::Replacements replacements;
   replacements.SetHostStr(host);
+  if (!path.empty())
+    replacements.SetPathStr(path);
   *url = url->ReplaceComponents(replacements);
 
   // Handle URLs to crash the browser or wreck the gpu process.
   if (host == chrome::kChromeUIBrowserCrashHost) {
     // Induce an intentional crash in the browser process.
     CHECK(false);
   } else if (host == chrome::kChromeUIGpuCleanHost) {
     GpuProcessHost::SendOnIO(
         0, content::CAUSE_FOR_GPU_LAUNCH_NO_LAUNCH, new GpuMsg_Clean());
   } else if (host == chrome::kChromeUIGpuCrashHost) {
@@ skipping 46 matching lines @@
   return false;
 }
 
 std::vector<std::string> ChromePaths() {
   std::vector<std::string> paths;
   paths.reserve(arraysize(kChromePaths));
   for (size_t i = 0; i < arraysize(kChromePaths); i++)
     paths.push_back(kChromePaths[i]);
   return paths;
 }