Use the correct launcher assets for shelf alignment.

ash/launcher/overflow_bubble.h

Index: ash/launcher/overflow_bubble.h
diff --git a/ash/launcher/overflow_bubble.h b/ash/launcher/overflow_bubble.h
index 5d5e747885310005412752bcd699cf297974707f..b1ea42e8dcb430986a8b06b5417dd4d671e29595 100644
--- a/ash/launcher/overflow_bubble.h
+++ b/ash/launcher/overflow_bubble.h
@@ -5,7 +5,6 @@
 #ifndef ASH_LAUNCHER_OVERFLOW_BUBBLE_H_
 #define ASH_LAUNCHER_OVERFLOW_BUBBLE_H_
 
-#include "ash/shelf_types.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/views/widget/widget_observer.h"
@@ -32,7 +31,6 @@ class OverflowBubble : public views::WidgetObserver {
   void Show(LauncherDelegate* delegate,
             LauncherModel* model,
             views::View* anchor,
-            ShelfAlignment shelf_alignment,
             int overflow_start_index);
 
   void Hide();