ash: Convert ShelfDelegate to use WmShelf* instead of Shelf*

ash/mus/shell_delegate_mus.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/mus/shell_delegate_mus.h"
 
 #include <utility>
 
 #include "ash/common/gpu_support_stub.h"
 #include "ash/common/media_delegate.h"
@@ skipping 86 matching lines @@
  private:
   DISALLOW_COPY_AND_ASSIGN(MediaDelegateStub);
 };
 
 class ShelfDelegateStub : public ShelfDelegate {
  public:
   ShelfDelegateStub() {}
   ~ShelfDelegateStub() override {}
 
   // ShelfDelegate overrides:
-  void OnShelfCreated(Shelf* shelf) override {}
-  void OnShelfDestroyed(Shelf* shelf) override {}
-  void OnShelfAlignmentChanged(Shelf* shelf) override {}
-  void OnShelfAutoHideBehaviorChanged(Shelf* shelf) override {}
-  void OnShelfAutoHideStateChanged(Shelf* shelf) override {}
-  void OnShelfVisibilityStateChanged(Shelf* shelf) override {}
+  void OnShelfCreated(WmShelf* shelf) override {}
+  void OnShelfDestroyed(WmShelf* shelf) override {}
+  void OnShelfAlignmentChanged(WmShelf* shelf) override {}
+  void OnShelfAutoHideBehaviorChanged(WmShelf* shelf) override {}
+  void OnShelfAutoHideStateChanged(WmShelf* shelf) override {}
+  void OnShelfVisibilityStateChanged(WmShelf* shelf) override {}
   ShelfID GetShelfIDForAppID(const std::string& app_id) override { return 0; }
   bool HasShelfIDToAppIDMapping(ShelfID id) const override { return false; }
   const std::string& GetAppIDForShelfID(ShelfID id) override {
     return base::EmptyString();
   }
   void PinAppWithID(const std::string& app_id) override {}
   bool IsAppPinned(const std::string& app_id) override { return false; }
   void UnpinAppWithID(const std::string& app_id) override {}
 
  private:
@@ skipping 120 matching lines @@
   NOTIMPLEMENTED();
   return base::string16();
 }
 
 gfx::Image ShellDelegateMus::GetDeprecatedAcceleratorImage() const {
   NOTIMPLEMENTED();
   return gfx::Image();
 }
 
 }  // namespace ash