Make toasts notice when they're hidden and send the mouse-out event.

ui/message_center/views/message_popup_collection.cc

 // Copyright (c) 2013 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/message_center/views/message_popup_collection.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/i18n/rtl.h"
@@ skipping 82 matching lines @@
 
 MessagePopupCollection::~MessagePopupCollection() {
   gfx::Screen* screen = parent_ ?
       gfx::Screen::GetScreenFor(parent_) : gfx::Screen::GetNativeScreen();
   screen->RemoveObserver(this);
   message_center_->RemoveObserver(this);
   CloseAllWidgets();
 }
 
 void MessagePopupCollection::RemoveToast(ToastContentsView* toast) {
+  OnMouseExited(toast);
+
   for (Toasts::iterator iter = toasts_.begin(); iter != toasts_.end(); ++iter) {
     if ((*iter) == toast) {
       toasts_.erase(iter);
       break;
     }
   }
 }
 
 void MessagePopupCollection::UpdateWidgets() {
   NotificationList::PopupNotifications popups =
@@ skipping 402 matching lines @@
       views::Widget* widget = (*iter)->GetWidget();
       if (widget)
         return widget->GetWindowBoundsInScreen();
       break;
     }
   }
   return gfx::Rect();
 }
 
 }  // namespace message_center