Revert of gpu: GPU service scheduler.

gpu/command_buffer/common/scheduling_priority.cc

Index: gpu/command_buffer/common/scheduling_priority.cc
diff --git a/gpu/command_buffer/common/scheduling_priority.cc b/gpu/command_buffer/common/scheduling_priority.cc
deleted file mode 100644
index 62b6456c9217f3fe3b464c8dd319fc6b1ef4eb51..0000000000000000000000000000000000000000
--- a/gpu/command_buffer/common/scheduling_priority.cc
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright 2017 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/scheduling_priority.h"
-
-#include "base/logging.h"
-
-namespace gpu {
-
-const char* SchedulingPriorityToString(SchedulingPriority priority) {
-  switch (priority) {
-    case SchedulingPriority::kHighest:
-      return "Highest";
-    case SchedulingPriority::kHigh:
-      return "High";
-    case SchedulingPriority::kNormal:
-      return "Normal";
-    case SchedulingPriority::kLow:
-      return "Low";
-    case SchedulingPriority::kLowest:
-      return "Lowest";
-  }
-  NOTREACHED();
-  return "";
-}
-
-}  // namespace gpu