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

ash/root_window_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_ROOT_WINDOW_CONTROLLER_H_
 #define ASH_ROOT_WINDOW_CONTROLLER_H_
 
 #include <map>
 #include <memory>
 #include <vector>
@@ skipping 225 matching lines @@
 
   // Called when the wallpaper animation is finished. Updates
   // |system_wallpaper_| to be black and drops |boot_splash_screen_| and moves
   // the wallpaper controller into the root window controller. |widget| holds
   // the wallpaper image, or NULL if the wallpaper is a solid color.
   void OnWallpaperAnimationFinished(views::Widget* widget);
 
   // Deletes associated objects and clears the state, but doesn't delete
   // the root window yet. This is used to delete a secondary displays'
   // root window safely when the display disconnect signal is received,
-  // which may come while we're in the nested message loop.
+  // which may come while we're in the nested run loop.
   void Shutdown();
 
   // Deletes all child windows and performs necessary cleanup.
   void CloseChildWindows();
 
   // Moves child windows to |dest|.
   void MoveWindowsTo(aura::Window* dest);
 
   // Force the shelf to query for it's current visibility state.
   void UpdateShelfVisibility();
@@ skipping 119 matching lines @@
 
 // On classic ash, returns the RootWindowController for the given |root_window|.
 // On mus ash, returns the RootWindowController for the primary display.
 // See RootWindowController class comment above.
 ASH_EXPORT RootWindowController* GetRootWindowController(
     const aura::Window* root_window);
 
 }  // namespace ash
 
 #endif  // ASH_ROOT_WINDOW_CONTROLLER_H_