Cleanup: Remove unneeded forward declarations in webkit/plugins/.

webkit/plugins/ppapi/ppb_context_3d_impl.h

 // Copyright (c) 2011 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 WEBKIT_PLUGINS_PPAPI_PPB_CONTEXT_3D_IMPL_H_
 #define WEBKIT_PLUGINS_PPAPI_PPB_CONTEXT_3D_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/thunk/ppb_context_3d_api.h"
 #include "webkit/plugins/ppapi/plugin_delegate.h"
 
-struct PPB_Context3DTrusted_Dev;
-
 namespace gpu {
-class CommandBuffer;
 namespace gles2 {
 class GLES2CmdHelper;
 class GLES2Implementation;
 }  // namespace gles2
 }  // namespace gpu
 
 namespace webkit {
 namespace ppapi {
 
 class PPB_Surface3D_Impl;
@@ skipping 84 matching lines @@
 
   base::WeakPtrFactory<PPB_Context3D_Impl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_Context3D_Impl);
 };
 
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_PPB_CONTEXT_3D_IMPL_H_