Use standard icon/title in global error bubble

ui/views/bubble/bubble_frame_view.h

Index: ui/views/bubble/bubble_frame_view.h
diff --git a/ui/views/bubble/bubble_frame_view.h b/ui/views/bubble/bubble_frame_view.h
index 87fc1d78ca4d229a1fcd024c8e7eafd23bed3ae8..e86415d0b866b4ccc2f0fa0a7238260c92aa8c6e 100644
--- a/ui/views/bubble/bubble_frame_view.h
+++ b/ui/views/bubble/bubble_frame_view.h
@@ -21,6 +21,7 @@ namespace views {
 class Label;
 class LabelButton;
 class BubbleBorder;
+class ImageView;
 
 // The non-client frame view of bubble-styled widgets.
 class VIEWS_EXPORT BubbleFrameView : public NonClientFrameView,
@@ -112,7 +113,8 @@ class VIEWS_EXPORT BubbleFrameView : public NonClientFrameView,
   // Margins between the content and the inside of the border, in pixels.
   gfx::Insets content_margins_;
 
-  // The optional title and (x) close button.
+  // The optional title icon, title, and (x) close button.
+  views::ImageView* title_icon_;
   Label* title_;
   LabelButton* close_;