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

gpu/command_buffer/client/gpu_control_client.h

Index: gpu/command_buffer/client/gpu_control_client.h
diff --git a/gpu/command_buffer/client/gpu_control_client.h b/gpu/command_buffer/client/gpu_control_client.h
deleted file mode 100644
index aaee9b197ee9a47e5df0c314192963a621b07fb9..0000000000000000000000000000000000000000
--- a/gpu/command_buffer/client/gpu_control_client.h
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright 2016 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_CLIENT_H_
-#define GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_CLIENT_H_
-
-#include <cstdint>
-
-namespace gpu {
-
-class GpuControlClient {
- public:
-  virtual void OnGpuControlLostContext() = 0;
-  virtual void OnGpuControlErrorMessage(const char* message, int32_t id) = 0;
-};
-
-}  // namespace gpu
-
-#endif  // GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_CLIENT_H_