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

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

Index: third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
index 6215f4017c61d3ccf517ebf852bfbbe2a91ee3f5..243f0d9e1ad29f4ff596a8c3f91e7871feb157da 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
@@ -14,6 +14,7 @@
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/pending_task.h"
+#include "base/run_loop.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 #include "platform/scheduler/base/enqueue_order.h"
@@ -53,7 +54,7 @@ class TaskTimeObserver;
 //
 class BLINK_PLATFORM_EXPORT TaskQueueManager
     : public internal::TaskQueueSelector::Observer,
-      public base::MessageLoop::NestingObserver {
+      public base::RunLoop::NestingObserver {
  public:
   // Create a task queue manager where |delegate| identifies the thread
   // on which where the tasks are  eventually run. Category strings must have
@@ -236,8 +237,8 @@ class BLINK_PLATFORM_EXPORT TaskQueueManager
   void OnTriedToSelectBlockedWorkQueue(
       internal::WorkQueue* work_queue) override;
 
-  // base::MessageLoop::NestingObserver implementation:
-  void OnBeginNestedMessageLoop() override;
+  // base::RunLoop::NestingObserver implementation:
+  void OnBeginNestedRunLoop() override;
 
   // Called by the task queue to register a new pending task.
   void DidQueueTask(const internal::TaskQueueImpl::Task& pending_task);