Load the default favicon as a native image, rather than as a Skia image.

chrome/browser/chrome_content_browser_client.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 #define CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 116 matching lines @@
       const GURL& current_url,
       const GURL& new_url) OVERRIDE;
   virtual bool ShouldAssignSiteForURL(const GURL& url) OVERRIDE;
   virtual std::string GetCanonicalEncodingNameByAliasName(
       const std::string& alias_name) OVERRIDE;
   virtual void AppendExtraCommandLineSwitches(base::CommandLine* command_line,
                                               int child_process_id) OVERRIDE;
   virtual std::string GetApplicationLocale() OVERRIDE;
   virtual std::string GetAcceptLangs(
       content::BrowserContext* context) OVERRIDE;
-  virtual gfx::ImageSkia* GetDefaultFavicon() OVERRIDE;
+  virtual const gfx::ImageSkia* GetDefaultFavicon() OVERRIDE;
   virtual bool AllowAppCache(const GURL& manifest_url,
                              const GURL& first_party,
                              content::ResourceContext* context) OVERRIDE;
   virtual bool AllowGetCookie(const GURL& url,
                               const GURL& first_party,
                               const net::CookieList& cookie_list,
                               content::ResourceContext* context,
                               int render_process_id,
                               int render_frame_id) OVERRIDE;
   virtual bool AllowSetCookie(const GURL& url,
@@ skipping 165 matching lines @@
   prerender::PrerenderTracker* prerender_tracker_;
 
   friend class DisableWebRtcEncryptionFlagTest;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeContentBrowserClient);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_