Do not send mouse-move when target is destroyed due to synthesized mouse-exit in RootWindow

ui/aura/root_window.cc

 // 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.
 
 #include "ui/aura/root_window.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 1112 matching lines @@
           const MouseMovedHandlerSetReason reason =
               (event->flags() & ui::EF_IS_SYNTHESIZED) == 0 ?
               MOUSE_MOVED_HANDLER_SET_REASON_MOUSE_MOVED :
               MOUSE_MOVED_HANDLER_SET_REASON_MOUSE_MOVED_SYNTHESIZED;
           SetMouseMovedHandler(target, reason);
           DispatchMouseEnterOrExit(*event, ui::ET_MOUSE_ENTERED);
           if (!destroyed_tracker.Contains(this))
             return false;
         } else {
           SetMouseMovedHandler(NULL, MOUSE_MOVED_HANDLER_SET_REASON_NULL);
+          return false;
         }
       }
       break;
     case ui::ET_MOUSE_PRESSED:
       // Don't set the mouse pressed handler for non client mouse down events.
       // These are only sent by Windows and are not always followed with non
       // client mouse up events which causes subsequent mouse events to be
       // sent to the wrong target.
       if (!(event->flags() & ui::EF_IS_NON_CLIENT) && !mouse_pressed_handler_)
         mouse_pressed_handler_ = target;
@@ skipping 147 matching lines @@
 }
 
 gfx::Transform RootWindow::GetInverseRootTransform() const {
   float scale = ui::GetDeviceScaleFactor(layer());
   gfx::Transform transform;
   transform.Scale(1.0f / scale, 1.0f / scale);
   return transformer_->GetInverseTransform() * transform;
 }
 
 }  // namespace aura