Refactor LauncherItemController and LauncherItemDelegate

ash/shelf/app_list_shelf_item_delegate.h

Index: ash/shelf/app_list_shelf_item_delegate.h
diff --git a/ash/shelf/app_list_shelf_item_delegate.h b/ash/shelf/app_list_shelf_item_delegate.h
index fe3c94e59a770ba166129f1dd51f143ad07f917f..282759974f8b5eb060d0ae6ed7eca0f6f12807cd 100644
--- a/ash/shelf/app_list_shelf_item_delegate.h
+++ b/ash/shelf/app_list_shelf_item_delegate.h
@@ -20,17 +20,13 @@ class AppListShelfItemDelegate : public LauncherItemDelegate {
   virtual ~AppListShelfItemDelegate();
 
   // ash::LauncherItemDelegate overrides:
-  virtual void ItemSelected(const LauncherItem& item,
-                            const ui::Event& event) OVERRIDE;
-  virtual base::string16 GetTitle(const LauncherItem& item) OVERRIDE;
+  virtual void ItemSelected(const ui::Event& event) OVERRIDE;
+  virtual base::string16 GetTitle() OVERRIDE;
   virtual ui::MenuModel* CreateContextMenu(
-      const LauncherItem& item,
       aura::RootWindow* root_window) OVERRIDE;
-  virtual LauncherMenuModel* CreateApplicationMenu(
-      const LauncherItem& item,
-      int event_flags) OVERRIDE;
-  virtual bool IsDraggable(const LauncherItem& item) OVERRIDE;
-  virtual bool ShouldShowTooltip(const LauncherItem& item) OVERRIDE;
+  virtual LauncherMenuModel* CreateApplicationMenu(int event_flags) OVERRIDE;
+  virtual bool IsDraggable() OVERRIDE;
+  virtual bool ShouldShowTooltip() OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AppListShelfItemDelegate);