chromeos: Rename ash::WmShelf to Shelf

ash/shelf/shelf_view.h

Index: ash/shelf/shelf_view.h
diff --git a/ash/shelf/shelf_view.h b/ash/shelf/shelf_view.h
index 501b82a335d725739d0d232a4424046de281f2b8..50656eac6a156e5f8e7a2e24890a518c95e68ff0 100644
--- a/ash/shelf/shelf_view.h
+++ b/ash/shelf/shelf_view.h
@@ -43,11 +43,11 @@ class DragImageView;
 class OverflowBubble;
 class OverflowButton;
 class ScopedRootWindowForNewWindows;
+class Shelf;
 class ShelfButton;
 class ShelfModel;
 struct ShelfItem;
 class ShelfWidget;
-class WmShelf;
 
 namespace test {
 class ShelfViewTestAPI;
@@ -69,12 +69,10 @@ class ASH_EXPORT ShelfView : public views::View,
                              public views::BoundsAnimatorObserver,
                              public app_list::ApplicationDragAndDropHost {
  public:
-  ShelfView(ShelfModel* model,
-            WmShelf* wm_shelf,
-            ShelfWidget* shelf_widget);
+  ShelfView(ShelfModel* model, Shelf* shelf, ShelfWidget* shelf_widget);
   ~ShelfView() override;
 
-  WmShelf* wm_shelf() const { return wm_shelf_; }
+  Shelf* shelf() const { return shelf_; }
   ShelfModel* model() const { return model_; }
 
   void Init();
@@ -358,7 +356,7 @@ class ASH_EXPORT ShelfView : public views::View,
   ShelfModel* model_;
 
   // The shelf controller; owned by RootWindowController.
-  WmShelf* wm_shelf_;
+  Shelf* shelf_;
 
   // The shelf widget for this view. For overflow bubbles, this is the widget
   // for the shelf, not for the bubble.