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

ppapi/proxy/ppapi_command_buffer_proxy.cc

 // 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.
 
 #include "ppapi/proxy/ppapi_command_buffer_proxy.h"
 
 #include <utility>
 
 #include "base/numerics/safe_conversions.h"
 #include "ppapi/proxy/ppapi_messages.h"
@@ skipping 223 matching lines @@
 
 int32_t PpapiCommandBufferProxy::GetExtraCommandBufferData() const {
   return 0;
 }
 
 void PpapiCommandBufferProxy::SignalQuery(uint32_t query,
                                           const base::Closure& callback) {
   NOTREACHED();
 }
 
-void PpapiCommandBufferProxy::SetGpuControlClient(gpu::GpuControlClient*) {
-  // TODO(piman): The lost context callback skips past here and goes directly
-  // to the plugin instance. Make it more uniform and use the GpuControlClient.
-}
-
 gpu::Capabilities PpapiCommandBufferProxy::GetCapabilities() {
   return capabilities_;
 }
 
 int32_t PpapiCommandBufferProxy::CreateImage(ClientBuffer buffer,
                                              size_t width,
                                              size_t height,
                                              unsigned internalformat) {
   NOTREACHED();
   return -1;
@@ skipping 67 matching lines @@
   message->set_unblock(true);
   Send(message);
 
   flush_info_->flush_pending = false;
   flush_info_->resource.SetHostResource(0, 0);
   flushed_fence_sync_release_ = pending_fence_sync_release_;
 }
 
 }  // namespace proxy
 }  // namespace ppapi