ash: Move AppList support to ShelfWidget, expose ShelfWidget in WmShelf

ash/common/shelf/shelf.h

Index: ash/common/shelf/shelf.h
diff --git a/ash/common/shelf/shelf.h b/ash/common/shelf/shelf.h
index 233a5065242c88fe6c2f998844ee4c1755550520..066e124356b8bd8180c7a07b979c22e9dacff964 100644
--- a/ash/common/shelf/shelf.h
+++ b/ash/common/shelf/shelf.h
@@ -9,16 +9,11 @@
 #include "ash/common/shelf/shelf_widget.h"
 #include "base/macros.h"
 
-namespace app_list {
-class ApplicationDragAndDropHost;
-}
-
 namespace gfx {
 class Rect;
 }
 
 namespace ash {
-class AppListButton;
 class ShelfView;
 class WmShelf;
 
@@ -48,8 +43,6 @@ class ASH_EXPORT Shelf {
   // TODO(jamescook): Remove this.
   WmShelf* wm_shelf() { return wm_shelf_; }
 
-  AppListButton* GetAppListButton() const;
-
   ShelfWidget* shelf_widget() { return shelf_widget_; }
 
   // TODO(msw): ShelfLayoutManager should not be accessed externally.
@@ -57,9 +50,6 @@ class ASH_EXPORT Shelf {
     return shelf_widget_->shelf_layout_manager();
   }
 
-  // Returns ApplicationDragAndDropHost for this shelf.
-  app_list::ApplicationDragAndDropHost* GetDragAndDropHostForAppList();
-
   ShelfView* shelf_view_for_testing() { return shelf_view_; }
 
  private: