Revert of Make lost context and error message callbacks on GpuControl go to client

ppapi/proxy/ppapi_command_buffer_proxy.h

 // Copyright (c) 2012 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_COMMAND_BUFFER_PROXY_H_
 #define PPAPI_PROXY_COMMAND_BUFFER_PROXY_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 36 matching lines @@
   void Flush(int32_t put_offset) override;
   void OrderingBarrier(int32_t put_offset) override;
   void WaitForTokenInRange(int32_t start, int32_t end) override;
   void WaitForGetOffsetInRange(int32_t start, int32_t end) override;
   void SetGetBuffer(int32_t transfer_buffer_id) override;
   scoped_refptr<gpu::Buffer> CreateTransferBuffer(size_t size,
                                                   int32_t* id) override;
   void DestroyTransferBuffer(int32_t id) override;
 
   // gpu::GpuControl implementation:
-  void SetGpuControlClient(gpu::GpuControlClient*) override;
   gpu::Capabilities GetCapabilities() override;
   int32_t CreateImage(ClientBuffer buffer,
                       size_t width,
                       size_t height,
                       unsigned internalformat) override;
   void DestroyImage(int32_t id) override;
   int32_t CreateGpuMemoryBufferImage(size_t width,
                                      size_t height,
                                      unsigned internalformat,
                                      unsigned usage) override;
@@ skipping 42 matching lines @@
   uint64_t flushed_fence_sync_release_;
   uint64_t validated_fence_sync_release_;
 
   DISALLOW_COPY_AND_ASSIGN(PpapiCommandBufferProxy);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif // PPAPI_PROXY_COMMAND_BUFFER_PROXY_H_