chrome: Cleanup class/struct forward declarations

chrome/browser/renderer_host/chrome_render_message_filter.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_RENDERER_HOST_CHROME_RENDER_MESSAGE_FILTER_H_
 #define CHROME_BROWSER_RENDERER_HOST_CHROME_RENDER_MESSAGE_FILTER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 20 matching lines @@
 }
 
 namespace content_settings {
 class CookieSettings;
 }
 
 namespace network_hints {
 struct LookupRequest;
 }
 
-namespace extensions {
-class InfoMap;
-}
-
 // This class filters out incoming Chrome-specific IPC messages for the renderer
 // process on the IPC thread.
 class ChromeRenderMessageFilter : public content::BrowserMessageFilter {
  public:
   ChromeRenderMessageFilter(
       int render_process_id,
       Profile* profile,
       content::ServiceWorkerContext* service_worker_context);
 
   // content::BrowserMessageFilter methods:
@@ skipping 89 matching lines @@
   // Used to look up permissions at database creation time.
   scoped_refptr<content_settings::CookieSettings> cookie_settings_;
 
   // Used to start Service Workers for navigation hints.
   content::ServiceWorkerContext* service_worker_context_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeRenderMessageFilter);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_CHROME_RENDER_MESSAGE_FILTER_H_