Patch AvatarMenuBubbleView crash; only SizeToContents if GetBubbleFrameView.

ui/views/bubble/bubble_delegate.cc

Index: ui/views/bubble/bubble_delegate.cc
diff --git a/ui/views/bubble/bubble_delegate.cc b/ui/views/bubble/bubble_delegate.cc
index 9a790d971511be39842c85651964314fcb4fe3e5..663cec9951fbfa1580224f083b4ce93b875e6972 100644
--- a/ui/views/bubble/bubble_delegate.cc
+++ b/ui/views/bubble/bubble_delegate.cc
@@ -279,7 +279,8 @@ void BubbleDelegateView::SizeToContents() {
 
 BubbleFrameView* BubbleDelegateView::GetBubbleFrameView() const {
   const Widget* widget = border_widget_ ? border_widget_ : GetWidget();
-  return static_cast<BubbleFrameView*>(widget->non_client_view()->frame_view());
+  const NonClientView* view = widget ? widget->non_client_view() : NULL;
+  return view ? static_cast<BubbleFrameView*>(view->frame_view()) : NULL;
 }
 
 gfx::Rect BubbleDelegateView::GetBubbleBounds() {