Remove icon bg color for message center notifications.

ui/message_center/notification.h

Index: ui/message_center/notification.h
diff --git a/ui/message_center/notification.h b/ui/message_center/notification.h
index f5abfe4d14ec40221a5ed2b90a1db785d670f96e..579c2be36bc3566a463badfdc477d48fcb40b5e3 100644
--- a/ui/message_center/notification.h
+++ b/ui/message_center/notification.h
@@ -171,11 +171,6 @@ class MESSAGE_CENTER_EXPORT Notification {
   const gfx::Image& icon() const { return icon_; }
   void set_icon(const gfx::Image& icon) { icon_ = icon; }
 
-  // Gets and sets whether to draw a solid background colour behind the
-  // notification's icon. Only applies to the Views implementation.
-  bool draw_icon_background() const { return draw_icon_background_; }
-  void set_draw_icon_background(bool draw) { draw_icon_background_ = draw; }
-
   const gfx::Image& image() const { return optional_fields_.image; }
   void set_image(const gfx::Image& image) { optional_fields_.image = image; }
 
@@ -268,10 +263,6 @@ class MESSAGE_CENTER_EXPORT Notification {
   // Image data for the associated icon, used by Ash when available.
   gfx::Image icon_;
 
-  // True by default; controls whether to draw a solid background colour behind
-  // the |icon_|. Only applies to the Views implementation.
-  bool draw_icon_background_;
-
   // The display string for the source of the notification.  Could be
   // the same as origin_url_, or the name of an extension.
   base::string16 display_source_;