blimp: Cleanup class/struct forward declarations

blimp/client/test/compositor/test_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_TEST_COMPOSITOR_TEST_BLIMP_EMBEDDER_COMPOSITOR_H_
 #define BLIMP_CLIENT_TEST_COMPOSITOR_TEST_BLIMP_EMBEDDER_COMPOSITOR_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "blimp/client/support/compositor/blimp_embedder_compositor.h"
 
-class SkBitmap;
-
-namespace cc {
-class CopyOutputResult;
-}  // namespace cc
-
 namespace blimp {
 namespace client {
 class CompositorDependencies;
 
 // An implementation of the BlimpEmbedderCompositor that supplies a
 // ContextProvider that is not backed by a platform specific widget.  It is not
 // meant to be used to actually display content.
 class TestBlimpEmbedderCompositor : public BlimpEmbedderCompositor {
  public:
   explicit TestBlimpEmbedderCompositor(
       CompositorDependencies* compositor_dependencies);
   ~TestBlimpEmbedderCompositor() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestBlimpEmbedderCompositor);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_TEST_COMPOSITOR_TEST_BLIMP_EMBEDDER_COMPOSITOR_H_