Avoid sync IPCs for FileSystem API

chrome/browser/content_settings/tab_specific_content_settings.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_CONTENT_SETTINGS_TAB_SPECIFIC_CONTENT_SETTINGS_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_TAB_SPECIFIC_CONTENT_SETTINGS_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 278 matching lines @@
       const GURL& validated_url,
       bool is_error_page,
       bool is_iframe_srcdoc,
       content::RenderViewHost* render_view_host) OVERRIDE;
   virtual void AppCacheAccessed(const GURL& manifest_url,
                                 bool blocked_by_policy) OVERRIDE;
 
   // Message handlers. Public for testing.
   void OnContentBlocked(ContentSettingsType type);
   void OnContentAllowed(ContentSettingsType type);
+  void OnRequestFileSystemAccess(const IPC::Message& message);
 
   // These methods are invoked on the UI thread by the static functions above.
   // Public for testing.
   void OnCookiesRead(const GURL& url,
                      const GURL& first_party_url,
                      const net::CookieList& cookie_list,
                      bool blocked_by_policy);
   void OnCookieChanged(const GURL& url,
                        const GURL& first_party_url,
                        const std::string& cookie_line,
@@ skipping 101 matching lines @@
 
   // The devices to be displayed in the media bubble when the media stream
   // request is requesting certain specific devices.
   std::string media_stream_requested_audio_device_;
   std::string media_stream_requested_video_device_;
 
   DISALLOW_COPY_AND_ASSIGN(TabSpecificContentSettings);
 };
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_TAB_SPECIFIC_CONTENT_SETTINGS_H_