Extract shell methods from ApplicationImpl into a base class, and pass this to Initialize() instead.

components/clipboard/clipboard_application_delegate.h

 // Copyright 2015 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.
 
 #ifndef COMPONENTS_CLIPBOARD_CLIBPOARD_APPLICATION_DELEGATE_H_
 #define COMPONENTS_CLIPBOARD_CLIBPOARD_APPLICATION_DELEGATE_H_
 
 #include "base/macros.h"
 #include "components/clipboard/public/interfaces/clipboard.mojom.h"
 #include "mojo/services/tracing/public/cpp/tracing_impl.h"
 #include "mojo/shell/public/cpp/application_delegate.h"
 #include "mojo/shell/public/cpp/interface_factory.h"
 
 namespace mojo {
 class ApplicationConnection;
 }
 
 namespace clipboard {
 
 class ClipboardApplicationDelegate
     : public mojo::ApplicationDelegate,
       public mojo::InterfaceFactory<mojo::Clipboard> {
  public:
   ClipboardApplicationDelegate();
   ~ClipboardApplicationDelegate() override;
 
   // mojo::ApplicationDelegate implementation.
-  void Initialize(mojo::ApplicationImpl* app) override;
+  void Initialize(mojo::Shell* shell, const std::string& url,
+                  uint32_t id) override;
   bool AcceptConnection(
       mojo::ApplicationConnection* connection) override;
 
   // mojo::InterfaceFactory<mojo::Clipboard> implementation.
   void Create(mojo::ApplicationConnection* connection,
               mojo::InterfaceRequest<mojo::Clipboard> request) override;
 
  private:
   mojo::TracingImpl tracing_;
 
   DISALLOW_COPY_AND_ASSIGN(ClipboardApplicationDelegate);
 };
 
 }  // namespace clipboard
 
 #endif  // COMPONENTS_CLIPBOARD_CLIBPOARD_APPLICATION_DELEGATE_H_