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

webkit/plugins/ppapi/ppb_file_io_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_FILE_IO_IMPL_H_
 #define WEBKIT_PLUGINS_PPAPI_PPB_FILE_IO_IMPL_H_
 
 #include <queue>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/platform_file.h"
 #include "ppapi/c/pp_file_info.h"
 #include "ppapi/c/pp_time.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/thunk/ppb_file_io_api.h"
 #include "webkit/plugins/ppapi/callbacks.h"
 #include "webkit/plugins/ppapi/plugin_delegate.h"
 
 struct PP_CompletionCallback;
 struct PPB_FileIO;
-struct PPB_FileIOTrusted;
 
 namespace webkit {
 namespace ppapi {
 
-class PluginModule;
-class PPB_FileRef_Impl;
 class QuotaFileIO;
 
 class PPB_FileIO_Impl : public ::ppapi::Resource,
                         public ::ppapi::thunk::PPB_FileIO_API {
  public:
   explicit PPB_FileIO_Impl(PP_Instance instance);
   virtual ~PPB_FileIO_Impl();
 
   // Resource overrides.
   virtual ::ppapi::thunk::PPB_FileIO_API* AsPPB_FileIO_API() OVERRIDE;
@@ skipping 101 matching lines @@
 
   base::WeakPtrFactory<PPB_FileIO_Impl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_FileIO_Impl);
 };
 
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_PPB_FILE_IO_IMPL_H_