Fix forward declartion in scene_layer.h.

chrome/browser/android/compositor/scene_layer/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_SCENE_LAYER_H_
 #define CHROME_BROWSER_ANDROID_COMPOSITOR_SCENE_LAYER_SCENE_LAYER_H_
 
 #include <jni.h>
 
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
+#include "cc/layers/layer.h"
 #include "third_party/skia/include/core/SkColor.h"
 
-namespace cc {
-class Layer;
-}
-
 namespace chrome {
 namespace android {
 
 // A native-side, cc::Layer based representation of how a scene should be drawn.
 // Basically, this is a wrapper around cc::Layer and bridge with its Java
 // counterpart.
 class SceneLayer {
  public:
   static SceneLayer* FromJavaObject(JNIEnv* env, jobject jobj);
 
@@ skipping 27 matching lines @@
  private:
   DISALLOW_COPY_AND_ASSIGN(SceneLayer);
 };
 
 bool RegisterSceneLayer(JNIEnv* env);
 
 }  // namespace android
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_ANDROID_COMPOSITOR_SCENE_LAYER_SCENE_LAYER_H_