components: Cleanup class/struct fwd declarations

components/favicon/core/favicon_handler.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 COMPONENTS_FAVICON_CORE_FAVICON_HANDLER_H_
 #define COMPONENTS_FAVICON_CORE_FAVICON_HANDLER_H_
 
 #include <stddef.h>
 
 #include <map>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "components/favicon/core/favicon_driver_observer.h"
 #include "components/favicon/core/favicon_url.h"
 #include "components/favicon_base/favicon_callback.h"
 #include "ui/gfx/favicon_size.h"
 #include "ui/gfx/image/image.h"
 #include "url/gurl.h"
 
 class SkBitmap;
 
-namespace base {
-class RefCountedMemory;
-}
-
 namespace favicon {
 
 class FaviconDriver;
 class FaviconService;
 class TestFaviconHandler;
 
 // FaviconHandler works with FaviconDriver to fetch the specific type of
 // favicon.
 //
 // FetchFavicon requests the favicon from the favicon service which in turn
@@ skipping 264 matching lines @@
   // available the favicon service and the current page are updated (assuming
   // the image is for a favicon).
   FaviconCandidate best_favicon_candidate_;
 
   DISALLOW_COPY_AND_ASSIGN(FaviconHandler);
 };
 
 }  // namespace favicon
 
 #endif  // COMPONENTS_FAVICON_CORE_FAVICON_HANDLER_H_