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

components/web_view/web_view_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_WEB_VIEW_WEB_VIEW_APPLICATION_DELEGATE_H_
 #define COMPONENTS_WEB_VIEW_WEB_VIEW_APPLICATION_DELEGATE_H_
 
 #include "base/macros.h"
 #include "components/web_view/public/interfaces/web_view.mojom.h"
 #include "mojo/common/weak_binding_set.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 web_view {
 
 class WebViewApplicationDelegate
     : public mojo::ApplicationDelegate,
       public mojom::WebViewFactory,
       public mojo::InterfaceFactory<mojom::WebViewFactory> {
  public:
   WebViewApplicationDelegate();
   ~WebViewApplicationDelegate() override;
 
  private:
   // Overridden from mojo::ApplicationDelegate:
-  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;
 
   // Overridden from mojom::WebViewFactory:
   void CreateWebView(mojom::WebViewClientPtr client,
                      mojo::InterfaceRequest<mojom::WebView> web_view) override;
 
   // Overridden from mojo::InterfaceFactory<mojom::WebView>:
   void Create(mojo::ApplicationConnection* connection,
               mojo::InterfaceRequest<mojom::WebViewFactory> request) override;
 
-  mojo::ApplicationImpl* app_;
+  mojo::Shell* shell_;
   mojo::TracingImpl tracing_;
 
   mojo::WeakBindingSet<WebViewFactory> factory_bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewApplicationDelegate);
 };
 
 }  // namespace web_view
 
 #endif  // COMPONENTS_WEB_VIEW_WEB_VIEW_APPLICATION_DELEGATE_H_