Revert of [scheduler] Add TaskQueue::Observer

third_party/WebKit/Source/platform/scheduler/base/thread_load_tracker.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 THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_LOAD_TRACKER_H_
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_LOAD_TRACKER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/time/time.h"
@@ skipping 18 matching lines @@
                     base::TimeDelta waiting_period);
   ~ThreadLoadTracker();
 
   void Pause(base::TimeTicks now);
   void Resume(base::TimeTicks now);
 
   void RecordTaskTime(base::TimeTicks start_time, base::TimeTicks end_time);
 
   void RecordIdle(base::TimeTicks now);
 
-  // TODO(altimin): Count wake_ups.
+  // TODO(altimin): Count wakeups.
 
  private:
   enum class ThreadState { ACTIVE, PAUSED };
 
   enum class TaskState { TASK_RUNNING, IDLE };
 
   // This function advances |time_| to |now|, calling |callback_|
   // in the process (multiple times if needed).
   void Advance(base::TimeTicks now, TaskState task_state);
 
@@ skipping 19 matching lines @@
 
   Callback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadLoadTracker);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_LOAD_TRACKER_H_