Revert of gpu: GPU service scheduler.

gpu/command_buffer/service/gpu_preferences.h

 // 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_SERVICE_GPU_PREFERENCES_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
@@ skipping 26 matching lines @@
 
   // Runs the renderer and plugins in the same process as the browser.
   bool single_process = false;
 
   // Run the GPU process as a thread in the browser process.
   bool in_process_gpu = false;
 
   // Prioritizes the UI's command stream in the GPU process.
   bool ui_prioritize_in_gpu_process = false;
 
-  // Enable the GPU process scheduler.
-  bool enable_gpu_scheduler = false;
-
   // Disables hardware acceleration of video decode, where available.
   bool disable_accelerated_video_decode = false;
 
 #if defined(OS_CHROMEOS)
   // Disables VA-API accelerated video encode.
   bool disable_vaapi_accelerated_video_encode = false;
 #endif
 
 #if BUILDFLAG(ENABLE_WEBRTC)
   // Disables HW encode acceleration for WebRTC.
@@ skipping 85 matching lines @@
   bool enable_es3_apis = true;
 
   // Use the Pass-through command decoder, skipping all validation and state
   // tracking.
   bool use_passthrough_cmd_decoder = false;
 };
 
 }  // namespace gpu
 
 #endif // GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_