PPAPI/NaCl: Make ImageData for NaCl just use shared memory

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_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"
@@ skipping 18 matching lines @@
 
   // PPB_Buffer_API implementation.
   virtual PP_Bool Describe(uint32_t* size_in_bytes) OVERRIDE;
   virtual PP_Bool IsMapped() OVERRIDE;
   virtual void* Map() OVERRIDE;
   virtual void Unmap() OVERRIDE;
 
  private:
   base::SharedMemory shm_;
   uint32_t size_;
-  void* mapped_data_;
   int map_count_;
 
   DISALLOW_COPY_AND_ASSIGN(Buffer);
 };
 
 class PPB_Buffer_Proxy : public InterfaceProxy {
  public:
   explicit PPB_Buffer_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_Buffer_Proxy();
 
@@ skipping 13 matching lines @@
   void OnMsgCreate(PP_Instance instance,
                    uint32_t size,
                    HostResource* result_resource,
                    base::SharedMemoryHandle* result_shm_handle);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_BUFFER_PROXY_H_