components: Cleanup class/struct fwd declarations

components/favicon/core/favicon_driver_impl.h

 // Copyright 2015 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_DRIVER_IMPL_H_
 #define COMPONENTS_FAVICON_CORE_FAVICON_DRIVER_IMPL_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "components/favicon/core/favicon_driver.h"
 
 class GURL;
 class SkBitmap;
 
 namespace bookmarks {
 class BookmarkModel;
 }
 
 namespace gfx {
-class Image;
 class Size;
 }
 
 namespace history {
 class HistoryService;
 }
 
 namespace favicon {
 
-class FaviconDriverObserver;
 class FaviconHandler;
 class FaviconService;
 struct FaviconURL;
 
 // FaviconDriverImpl is a partial implementation of FaviconDriver that allow
 // sharing implementation between different embedder.
 //
 // FaviconDriverImpl works with FaviconHandlers to fetch the favicons. It
 // fetches the given page's icons, requesting them from history backend. If the
 // icon is not available or expired, the icon will be downloaded and saved in
@@ skipping 47 matching lines @@
   // |touch_icon_handler_| may be null depending on the platform and variations.
   std::unique_ptr<FaviconHandler> favicon_handler_;
   std::unique_ptr<FaviconHandler> touch_icon_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(FaviconDriverImpl);
 };
 
 }  // namespace favicon
 
 #endif  // COMPONENTS_FAVICON_CORE_FAVICON_DRIVER_IMPL_H_