Make nesting/running states a RunLoop rather than a MessageLoop concept.

third_party/WebKit/Source/platform/scheduler/base/task_queue_manager_delegate.h

 // Copyright 2015 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_BASE_TASK_QUEUE_MANAGER_DELEGATE_H_
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_BASE_TASK_QUEUE_MANAGER_DELEGATE_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
-#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "base/time/tick_clock.h"
 #include "platform/PlatformExport.h"
 
 namespace blink {
 namespace scheduler {
 
 class PLATFORM_EXPORT TaskQueueManagerDelegate
     : public base::SingleThreadTaskRunner,
       public base::TickClock {
  public:
   TaskQueueManagerDelegate() {}
 
   // Returns true if the task runner is nested (i.e., running a run loop within
   // a nested task).
   virtual bool IsNested() const = 0;
 
   // A NestingObserver is notified when a nested message loop begins. The
   // observers are notified before the first task is processed.
-  virtual void AddNestingObserver(
-      base::MessageLoop::NestingObserver* observer) = 0;
+  virtual void AddNestingObserver(base::RunLoop::NestingObserver* observer) = 0;
 
   virtual void RemoveNestingObserver(
-      base::MessageLoop::NestingObserver* observer) = 0;
+      base::RunLoop::NestingObserver* observer) = 0;
 
  protected:
   ~TaskQueueManagerDelegate() override {}
 
   DISALLOW_COPY_AND_ASSIGN(TaskQueueManagerDelegate);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_BASE_TASK_QUEUE_MANAGER_DELEGATE_H_