Use the correct launcher assets for shelf alignment.

ash/launcher/launcher_button_host.h

Index: ash/launcher/launcher_button_host.h
diff --git a/ash/launcher/launcher_button_host.h b/ash/launcher/launcher_button_host.h
index 9a48cf60138392894b5b1e151f9dd9b7b8ababf8..37ed07a1f179d8a9a33f4a0e0661713b1d4ccce0 100644
--- a/ash/launcher/launcher_button_host.h
+++ b/ash/launcher/launcher_button_host.h
@@ -6,7 +6,6 @@
 #define ASH_LAUNCHER_LAUNCHER_BUTTON_HOST_H_
 
 #include "ash/ash_export.h"
-#include "ash/wm/shelf_types.h"
 #include "base/string16.h"
 
 namespace ui {
@@ -54,8 +53,6 @@ class ASH_EXPORT LauncherButtonHost {
   // Invoked when the mouse exits the item.
   virtual void MouseExitedButton(views::View* view) = 0;
 
-  virtual ShelfAlignment GetShelfAlignment() const = 0;
-
   // Invoked to get the accessible name of the item.
   virtual string16 GetAccessibleName(const views::View* view) = 0;