| Index: ui/message_center/message_popup_bubble.cc | 
| diff --git a/ui/message_center/message_popup_bubble.cc b/ui/message_center/message_popup_bubble.cc | 
| index 4b733c2f61ce47cdc76fb47e1a4c5f91e85fe1e7..fff762322196fc315cfb1181ec8eaf6bcf73184f 100644 | 
| --- a/ui/message_center/message_popup_bubble.cc | 
| +++ b/ui/message_center/message_popup_bubble.cc | 
| @@ -51,9 +51,11 @@ class PopupBubbleContentsView : public views::View { | 
| new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 1)); | 
| AddChildView(content_); | 
|  | 
| +#ifdef USE_AURA | 
| content_->SetPaintToLayer(true); | 
| content_->SetFillsBoundsOpaquely(false); | 
| content_->layer()->SetMasksToBounds(true); | 
| +#endif  // USE_AURA | 
| } | 
|  | 
| void Update(const NotificationList::Notifications& popup_notifications) { | 
|  |