WebView: Cleanup class/struct forward declarations

android_webview/browser/surfaces_instance.h

 // Copyright 2016 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 ANDROID_WEBVIEW_BROWSER_SURFACES_INSTANCE_H_
 #define ANDROID_WEBVIEW_BROWSER_SURFACES_INSTANCE_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 11 matching lines @@
 }
 
 namespace gfx {
 class Rect;
 class Size;
 class Transform;
 }
 
 namespace android_webview {
 
-class AwGLSurface;
 class ParentOutputSurface;
-class ScopedAppGLStateRestore;
 
 class SurfacesInstance : public base::RefCounted<SurfacesInstance>,
                          public cc::DisplayClient,
                          public cc::SurfaceFactoryClient {
  public:
   static scoped_refptr<SurfacesInstance> GetOrCreateInstance();
 
   cc::FrameSinkId AllocateFrameSinkId();
   cc::SurfaceManager* GetSurfaceManager();
 
@@ skipping 39 matching lines @@
 
   // This is owned by |display_|.
   ParentOutputSurface* output_surface_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfacesInstance);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_SURFACES_INSTANCE_H_