Cleanup: Remove unneeded forward declarations in ppapi.

ppapi/proxy/ppb_buffer_proxy.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 PPAPI_PPB_BUFFER_PROXY_H_
-#define PPAPI_PPB_BUFFER_PROXY_H_
+#ifndef PPAPI_PROXY_PPB_BUFFER_PROXY_H_
+#define PPAPI_PROXY_PPB_BUFFER_PROXY_H_
 
 #include "base/shared_memory.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/thunk/ppb_buffer_api.h"
 
-struct PPB_Buffer_Dev;
-
 namespace ppapi {
 
 class HostResource;
 
 namespace proxy {
 
 class Buffer : public thunk::PPB_Buffer_API, public Resource {
  public:
   Buffer(const HostResource& resource,
          const base::SharedMemoryHandle& shm_handle,
@@ skipping 13 matching lines @@
   base::SharedMemory shm_;
   uint32_t size_;
   void* mapped_data_;
   int map_count_;
 
   DISALLOW_COPY_AND_ASSIGN(Buffer);
 };
 
 class PPB_Buffer_Proxy : public InterfaceProxy {
  public:
-  PPB_Buffer_Proxy(Dispatcher* dispatcher);
+  explicit PPB_Buffer_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_Buffer_Proxy();
 
   static PP_Resource CreateProxyResource(PP_Instance instance,
                                          uint32_t size);
   static PP_Resource AddProxyResource(const HostResource& resource,
                                       base::SharedMemoryHandle shm_handle,
                                       uint32_t size);
 
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
   static const ApiID kApiID = API_ID_PPB_BUFFER;
 
  private:
   // Message handlers.
   void OnMsgCreate(PP_Instance instance,
                    uint32_t size,
                    HostResource* result_resource,
                    base::SharedMemoryHandle* result_shm_handle);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
-#endif  // PPAPI_PPB_BUFFER_PROXY_H_
+#endif  // PPAPI_PROXY_PPB_BUFFER_PROXY_H_