Revert of Added an extra sync token field for extra command buffer identification.

components/mus/gles2/command_buffer_local.cc

 // Copyright 2015 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 "components/mus/gles2/command_buffer_local.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/memory/shared_memory.h"
 #include "components/mus/gles2/command_buffer_local_client.h"
@@ skipping 210 matching lines @@
 }
 
 gpu::CommandBufferNamespace CommandBufferLocal::GetNamespaceID() const {
   return gpu::CommandBufferNamespace::MOJO_LOCAL;
 }
 
 uint64_t CommandBufferLocal::GetCommandBufferID() const {
   return command_buffer_id_;
 }
 
-int32_t CommandBufferLocal::GetExtraCommandBufferData() const {
-  return 0;
-}
-
 uint64_t CommandBufferLocal::GenerateFenceSyncRelease() {
   return next_fence_sync_release_++;
 }
 
 bool CommandBufferLocal::IsFenceSyncRelease(uint64_t release) {
   return release > 0 && release < next_fence_sync_release_;
 }
 
 bool CommandBufferLocal::IsFenceSyncFlushed(uint64_t release) {
   return IsFenceSyncRelease(release);
@@ skipping 95 matching lines @@
   gpu::CommandBuffer::State state = command_buffer_->GetLastState();
   OnContextLost(state.context_lost_reason);
 }
 
 void CommandBufferLocal::OnContextLost(uint32_t reason) {
   if (client_)
     client_->DidLoseContext();
 }
 
 }  // namespace mus