cc: Cleanup class/struct forward declarations

blimp/client/support/compositor/blimp_embedder_compositor.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 BLIMP_CLIENT_SUPPORT_COMPOSITOR_BLIMP_EMBEDDER_COMPOSITOR_H_
 #define BLIMP_CLIENT_SUPPORT_COMPOSITOR_BLIMP_EMBEDDER_COMPOSITOR_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "cc/layers/layer.h"
 #include "cc/surfaces/frame_sink_id.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_host_single_thread_client.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace cc {
 class AnimationHost;
+class ContextProvider;
 class Display;
 class LayerTreeHost;
 class SurfaceManager;
 }  // namespace cc
 
 namespace blimp {
 namespace client {
 class CompositorDependencies;
 
 // The parent compositor that embeds the content from the BlimpCompositor for
@@ skipping 63 matching lines @@
 
   base::Closure did_complete_swap_buffers_;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpEmbedderCompositor);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_SUPPORT_COMPOSITOR_BLIMP_EMBEDDER_COMPOSITOR_H_