chrome: Cleanup class/struct forward declarations

chrome/browser/android/compositor/tab_content_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 CHROME_BROWSER_ANDROID_COMPOSITOR_TAB_CONTENT_MANAGER_H_
 #define CHROME_BROWSER_ANDROID_COMPOSITOR_TAB_CONTENT_MANAGER_H_
 
 #include <jni.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_weak_ref.h"
 #include "base/containers/hash_tables.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "cc/layers/ui_resource_layer.h"
 #include "chrome/browser/android/thumbnail/thumbnail_cache.h"
 
 using base::android::ScopedJavaLocalRef;
 
 namespace cc {
-class CopyOutputResult;
 class Layer;
 }
 
 namespace ui {
 class UIResourceProvider;
 }
 
 namespace android {
 
 class ThumbnailLayer;
@@ skipping 87 matching lines @@
   base::WeakPtrFactory<TabContentManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TabContentManager);
 };
 
 bool RegisterTabContentManager(JNIEnv* env);
 
 }  // namespace android
 
 #endif  // CHROME_BROWSER_ANDROID_COMPOSITOR_TAB_CONTENT_MANAGER_H_