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

gpu/command_buffer/client/gpu_control.h

 // Copyright 2014 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 GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_H_
 #define GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 11 matching lines @@
 
 namespace base {
 class Lock;
 }
 
 namespace gfx {
 class GpuMemoryBuffer;
 }
 
 namespace gpu {
-class GpuControlClient;
 struct SyncToken;
 
 // Common interface for GpuControl implementations.
 class GPU_EXPORT GpuControl {
  public:
   GpuControl() {}
   virtual ~GpuControl() {}
 
-  virtual void SetGpuControlClient(GpuControlClient* gpu_control_client) = 0;
-
   virtual Capabilities GetCapabilities() = 0;
 
   // Create an image for a client buffer with the given dimensions and
   // format. Returns its ID or -1 on error.
   virtual int32_t CreateImage(ClientBuffer buffer,
                               size_t width,
                               size_t height,
                               unsigned internalformat) = 0;
 
   // Destroy an image. The ID must be positive.
@@ skipping 59 matching lines @@
   // be enqueued first so does not need to be flushed.
   virtual bool CanWaitUnverifiedSyncToken(const SyncToken* sync_token) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GpuControl);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_H_