chrome: Cleanup class/struct forward declarations

chrome/browser/android/compositor/scene_layer/contextual_search_scene_layer.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 CHROME_BROWSER_ANDROID_COMPOSITOR_SCENE_LAYER_CONTEXTUAL_SEARCH_SCENE_LAYER_H_
 #define CHROME_BROWSER_ANDROID_COMPOSITOR_SCENE_LAYER_CONTEXTUAL_SEARCH_SCENE_LAYER_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "chrome/browser/android/compositor/scene_layer/scene_layer.h"
 #include "chrome/browser/bitmap_fetcher/bitmap_fetcher.h"
 
 namespace cc {
 class Layer;
-class SolidColorLayer;
 }
 
 namespace android {
 
 class ContextualSearchLayer;
 
 class ContextualSearchSceneLayer : public SceneLayer,
     public chrome::BitmapFetcherDelegate {
  public:
   ContextualSearchSceneLayer(JNIEnv* env, jobject jobj);
@@ skipping 102 matching lines @@
   scoped_refptr<cc::Layer> content_container_;
 
   DISALLOW_COPY_AND_ASSIGN(ContextualSearchSceneLayer);
 };
 
 bool RegisterContextualSearchSceneLayer(JNIEnv* env);
 
 }  // namespace android
 
 #endif  // CHROME_BROWSER_ANDROID_COMPOSITOR_SCENE_LAYER_CONTEXTUAL_SEARCH_SCENE_LAYER_H_