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

third_party/WebKit/Source/platform/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h

Index: third_party/WebKit/Source/platform/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h
diff --git a/third_party/WebKit/Source/platform/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h b/third_party/WebKit/Source/platform/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h
index bdbd7464f07c16e383c20d8630070bff544bcd0f..6f143e7cec52c184f8d8607f224d3848a801b4e5 100644
--- a/third_party/WebKit/Source/platform/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h
+++ b/third_party/WebKit/Source/platform/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h
@@ -39,10 +39,8 @@ class LazySchedulerMessageLoopDelegateForTests : public SchedulerTqmDelegate {
                                   base::TimeDelta delay) override;
   bool RunsTasksOnCurrentThread() const override;
   bool IsNested() const override;
-  void AddNestingObserver(
-      base::MessageLoop::NestingObserver* observer) override;
-  void RemoveNestingObserver(
-      base::MessageLoop::NestingObserver* observer) override;
+  void AddNestingObserver(base::RunLoop::NestingObserver* observer) override;
+  void RemoveNestingObserver(base::RunLoop::NestingObserver* observer) override;
   base::TimeTicks NowTicks() override;
 
  private:
@@ -60,8 +58,6 @@ class LazySchedulerMessageLoopDelegateForTests : public SchedulerTqmDelegate {
   mutable scoped_refptr<base::SingleThreadTaskRunner> original_task_runner_;
   std::unique_ptr<base::TickClock> time_source_;
 
-  base::MessageLoop::NestingObserver* pending_observer_;
-
   DISALLOW_COPY_AND_ASSIGN(LazySchedulerMessageLoopDelegateForTests);
 };