chrome: Cleanup class/struct forward declarations

chrome/browser/android/compositor/scene_layer/static_tab_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_STATIC_TAB_SCENE_LAYER_H_
 #define CHROME_BROWSER_ANDROID_COMPOSITOR_SCENE_LAYER_STATIC_TAB_SCENE_LAYER_H_
 
 #include <jni.h>
 
 #include <memory>
 
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/android/compositor/scene_layer/scene_layer.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/geometry/size_f.h"
 
 namespace cc {
 class Layer;
 }
 
 namespace android {
 
 class ContentLayer;
-class ToolbarLayer;
 
 // A SceneLayer to render a static tab.
 class StaticTabSceneLayer : public SceneLayer {
  public:
   StaticTabSceneLayer(JNIEnv* env, jobject jobj);
   ~StaticTabSceneLayer() override;
 
   bool ShouldShowBackground() override;
   SkColor GetBackgroundColor() override;
 
@@ skipping 28 matching lines @@
   float brightness_;
 
   DISALLOW_COPY_AND_ASSIGN(StaticTabSceneLayer);
 };
 
 bool RegisterStaticTabSceneLayer(JNIEnv* env);
 
 }  // namespace android
 
 #endif  // CHROME_BROWSER_ANDROID_COMPOSITOR_SCENE_LAYER_STATIC_TAB_SCENE_LAYER_H_