chrome: Cleanup class/struct forward declarations

chrome/browser/android/compositor/layer_title_cache.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_LAYER_TITLE_CACHE_H_
 #define CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_TITLE_CACHE_H_
 
 #include <jni.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_weak_ref.h"
 #include "base/bind.h"
 #include "base/id_map.h"
 #include "base/macros.h"
 #include "cc/resources/ui_resource_client.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 class Layer;
-class UIResourceLayer;
 }
 
 namespace ui {
 class ResourceManager;
 }
 
 namespace android {
 
 class DecorationTitle;
 
@@ skipping 55 matching lines @@
   ui::ResourceManager* resource_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTitleCache);
 };
 
 bool RegisterLayerTitleCache(JNIEnv* env);
 
 }  // namespace android
 
 #endif  // CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_TITLE_CACHE_H_