Make //gpu/* pass gn check (and make it gn checked).

gpu/command_buffer/client/buffer_tracker.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 "gpu/command_buffer/client/buffer_tracker.h"
 
-#include "gpu/command_buffer/client/cmd_buffer_helper.h"
 #include "gpu/command_buffer/client/mapped_memory.h"
 
 namespace gpu {
 namespace gles2 {
 
 BufferTracker::BufferTracker(MappedMemoryManager* manager)
     : mapped_memory_(manager) {
 }
 
 BufferTracker::~BufferTracker() {
@@ skipping 62 matching lines @@
   buffer->size_ = 0;
   buffer->shm_id_ = 0;
   buffer->shm_offset_ = 0;
   buffer->address_ = NULL;
   buffer->last_usage_token_ = 0;
   buffer->last_async_upload_token_ = 0;
 }
 
 }  // namespace gles2
 }  // namespace gpu