Support Windows native textfield, combobox, etc. in new bubbles.

ui/aura_shell/examples/bubble.cc

Index: ui/aura_shell/examples/bubble.cc
diff --git a/ui/aura_shell/examples/bubble.cc b/ui/aura_shell/examples/bubble.cc
index 210b3f863a2db55a7596649772eebcb5cde058fd..3107485fb3c89483ff5d7b5bbf1a82f8fdf2d3cf 100644
--- a/ui/aura_shell/examples/bubble.cc
+++ b/ui/aura_shell/examples/bubble.cc
@@ -42,9 +42,10 @@ void CreatePointyBubble(views::Widget* parent, const gfx::Point& origin) {
   config.color = SK_ColorWHITE;
   config.anchor_point = origin;
   config.arrow = views::BubbleBorder::TOP_LEFT;
-  views::Widget* bubble = views::BubbleDelegateView::CreateBubble(
-      new ExampleBubbleDelegateView(config), parent);
-  bubble->Show();
+  ExampleBubbleDelegateView* bubble_delegate =
+      new ExampleBubbleDelegateView(config);
+  views::BubbleDelegateView::CreateBubble(bubble_delegate, parent);
+  bubble_delegate->Show();
 }
 
 }  // namespace examples