components: Cleanup class/struct fwd declarations

components/suggestions/image_manager.h

 // Copyright 2014 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_SUGGESTIONS_IMAGE_MANAGER_H_
 #define COMPONENTS_SUGGESTIONS_IMAGE_MANAGER_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 14 matching lines @@
 #include "url/gurl.h"
 
 namespace gfx {
 class Image;
 }
 
 namespace image_fetcher {
 class ImageFetcher;
 }
 
-namespace net {
-class URLRequestContextGetter;
-}
-
 namespace suggestions {
 
 class ImageData;
 class SuggestionsProfile;
 
 // A class used to fetch server images asynchronously and manage the caching
 // layer (both in memory and on disk).
 class ImageManager : public image_fetcher::ImageFetcherDelegate {
  public:
   typedef std::vector<ImageData> ImageDataVector;
@@ skipping 110 matching lines @@
   base::ThreadChecker thread_checker_;
 
   base::WeakPtrFactory<ImageManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageManager);
 };
 
 }  // namespace suggestions
 
 #endif  // COMPONENTS_SUGGESTIONS_IMAGE_MANAGER_H_