Replace "nested message loop" with "nested run loop" in comments.

ash/drag_drop/drag_drop_controller.h

 // Copyright (c) 2012 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 ASH_DRAG_DROP_DRAG_DROP_CONTROLLER_H_
 #define ASH_DRAG_DROP_DRAG_DROP_CONTROLLER_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 108 matching lines @@
 
   std::unique_ptr<gfx::LinearAnimation> cancel_animation_;
 
   // Window that started the drag.
   aura::Window* drag_source_window_;
 
   // Indicates whether the caller should be blocked on a drag/drop session.
   // Only be used for tests.
   bool should_block_during_drag_drop_;
 
-  // Closure for quitting nested message loop.
+  // Closure for quitting nested run loop.
   base::Closure quit_closure_;
 
   std::unique_ptr<ash::DragDropTracker> drag_drop_tracker_;
   std::unique_ptr<DragDropTrackerDelegate> drag_drop_window_delegate_;
 
   ui::DragDropTypes::DragEventSource current_drag_event_source_;
 
   // Holds a synthetic long tap event to be sent to the |drag_source_window_|.
   // See comment in OnGestureEvent() on why we need this.
   std::unique_ptr<ui::GestureEvent> pending_long_tap_;
 
   base::WeakPtrFactory<DragDropController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DragDropController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DRAG_DROP_DRAG_DROP_CONTROLLER_H_