Attempt to load component extension favicon from the resources first.

chrome/browser/ui/webui/chrome_web_ui_controller_factory.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/ui/webui/chrome_web_ui_controller_factory.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/about_flags.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 404 matching lines @@
   WebUIController* controller = (*function)(web_ui, url);
   if (controller)
     web_ui->AddMessageHandler(new GenericHandler());
   return controller;
 }
 
 void ChromeWebUIControllerFactory::GetFaviconForURL(
     Profile* profile,
     FaviconService::GetFaviconRequest* request,
     const GURL& page_url) const {
+  // Before determining whether page_url is an extension url, we must handle
+  // overrides. This changes urls in |kChromeUIScheme| to extension urls, and
+  // allows to use ExtensionWebUI::GetFaviconForURL.
+  GURL url(page_url);
+  ExtensionWebUI::HandleChromeURLOverride(&url, profile);
+
   // All extensions but the bookmark manager get their favicon from the icons
   // part of the manifest.
-  if (page_url.SchemeIs(chrome::kExtensionScheme) &&
-      page_url.host() != extension_misc::kBookmarkManagerId) {
-    ExtensionWebUI::GetFaviconForURL(profile, request, page_url);
+  if (url.SchemeIs(chrome::kExtensionScheme) &&
+      url.host() != extension_misc::kBookmarkManagerId) {
+    ExtensionWebUI::GetFaviconForURL(profile, request, url);
   } else {
     history::FaviconData favicon;
     favicon.image_data = scoped_refptr<RefCountedMemory>(
-        GetFaviconResourceBytes(page_url));
+        GetFaviconResourceBytes(url));
     favicon.known_icon = favicon.image_data.get() != NULL &&
                              favicon.image_data->size() > 0;
     favicon.icon_type = history::FAVICON;
     request->ForwardResultAsync(request->handle(), favicon);
   }
 }
 
 // static
 ChromeWebUIControllerFactory* ChromeWebUIControllerFactory::GetInstance() {
   return Singleton< ChromeWebUIControllerFactory, PossibleTestSingletonTraits<
@@ skipping 51 matching lines @@
   // Android doesn't use the Options pages.
   if (page_url.host() == chrome::kChromeUISettingsFrameHost)
     return options2::OptionsUI::GetFaviconResourceBytes();
 #endif
 
   if (page_url.host() == chrome::kChromeUIPluginsHost)
     return PluginsUI::GetFaviconResourceBytes();
 
   return NULL;
 }