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

ui/aura/window_event_dispatcher.cc

 // Copyright 2014 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.
 
 #include "ui/aura/window_event_dispatcher.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 844 matching lines @@
         // |details| contains information about |mouse_moved_handler_| being
         // destroyed which is not our |target|. Return value of this function
         // should be about our |target|.
         DispatchDetails target_details = details;
         target_details.target_destroyed = !live_window.Contains(target);
         if (details.dispatcher_destroyed) {
           event->SetHandled();
           return target_details;
         }
         // If the |mouse_moved_handler_| changes out from under us, assume a
-        // nested message loop ran and we don't need to do anything.
+        // nested run loop ran and we don't need to do anything.
         if (mouse_moved_handler_ != old_mouse_moved_handler) {
           event->SetHandled();
           return target_details;
         }
         if (details.target_destroyed || target_details.target_destroyed) {
           mouse_moved_handler_ = NULL;
           event->SetHandled();
           return target_details;
         }
         live_window.Remove(target);
@@ skipping 47 matching lines @@
   }
 
   // This flag is set depending on the gestures recognized in the call above,
   // and needs to propagate with the forwarded event.
   event->set_may_cause_scrolling(orig_event.may_cause_scrolling());
 
   return PreDispatchLocatedEvent(target, event);
 }
 
 }  // namespace aura