Change web notifications to show at the top of the list, clean up layout.

ash/system/tray/tray_bubble_view.h

Index: ash/system/tray/tray_bubble_view.h
diff --git a/ash/system/tray/tray_bubble_view.h b/ash/system/tray/tray_bubble_view.h
index 61dfd8ecffd722e196a48e88662507bc2a872d6a..d6887b79722f2c44066ac745611bd757c50838fc 100644
--- a/ash/system/tray/tray_bubble_view.h
+++ b/ash/system/tray/tray_bubble_view.h
@@ -68,8 +68,8 @@ class TrayBubbleView : public views::BubbleDelegateView {
   // Creates a bubble border with the specified arrow offset.
   void SetBubbleBorder(int arrow_offset);
 
-  // Called whenever the bubble anchor location may have moved.
-  void UpdateAnchor();
+  // Called whenever the bubble size or location may have moved.
+  void UpdateBubble();
 
   // Sets the maximum bubble height and resizes the bubble.
   void SetMaxHeight(int height);