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

gpu/command_buffer/service/mailbox_manager_unittest.cc

 // Copyright 2013 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/common/sync_token.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gpu_service_test.h"
 #include "gpu/command_buffer/service/mailbox_manager_impl.h"
 #include "gpu/command_buffer/service/mailbox_manager_sync.h"
 #include "gpu/command_buffer/service/texture_manager.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gl/gl_context_stub.h"
 #include "ui/gl/gl_mock.h"
 #include "ui/gl/gl_surface_stub.h"
 
 namespace gpu {
 namespace gles2 {
 
 using namespace ::testing;
 
 static const SyncToken g_sync_token(gpu::CommandBufferNamespace::GPU_IO,
-                                    0,
                                     123,
                                     0);
 
 class MailboxManagerTest : public GpuServiceTest {
  public:
   MailboxManagerTest() {}
   ~MailboxManagerTest() override {}
 
  protected:
   void SetUp() override {
@@ skipping 654 matching lines @@
   DestroyTexture(texture2);
   DestroyTexture(new_texture);
 }
 
 // TODO: Texture::level_infos_[][].size()
 
 // TODO: unsupported targets and formats
 
 }  // namespace gles2
 }  // namespace gpu