Revert of gpu: GPU service scheduler.

gpu/command_buffer/service/gpu_preferences.h

Index: gpu/command_buffer/service/gpu_preferences.h
diff --git a/gpu/command_buffer/service/gpu_preferences.h b/gpu/command_buffer/service/gpu_preferences.h
index 8dd0ff114ea67131c4667359926e895c2fee4dd3..b7db89f457c24d9f473656b55b5da718f27e7729 100644
--- a/gpu/command_buffer/service/gpu_preferences.h
+++ b/gpu/command_buffer/service/gpu_preferences.h
@@ -43,9 +43,6 @@
 
   // 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;