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

components/resource_provider/resource_provider_app.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_RESOURCE_PROVIDER_RESOURCE_PROVIDER_APP_H_
 #define COMPONENTS_RESOURCE_PROVIDER_RESOURCE_PROVIDER_APP_H_
 
 #include <map>
 
 #include "base/macros.h"
 #include "components/resource_provider/public/interfaces/resource_provider.mojom.h"
 #include "mojo/common/weak_binding_set.h"
 #include "mojo/public/cpp/bindings/binding.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 ApplicationImpl;
+class Shell;
 }
 
 namespace resource_provider {
 
 class ResourceProviderApp : public mojo::ApplicationDelegate,
                             public mojo::InterfaceFactory<ResourceProvider> {
  public:
   explicit ResourceProviderApp(const std::string& resource_provider_app_url);
   ~ResourceProviderApp() override;
 
  private:
   // 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;
 
   // mojo::InterfaceFactory<ResourceProvider>:
   void Create(mojo::ApplicationConnection* connection,
               mojo::InterfaceRequest<ResourceProvider> request) override;
 
   mojo::TracingImpl tracing_;
 
   mojo::WeakBindingSet<ResourceProvider> bindings_;
 
   // The name of the app that the resource provider code lives in. When using
   // core services, it'll be the url of that. Otherwise it'll just be
   // mojo:resource_provider.
   std::string resource_provider_app_url_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceProviderApp);
 };
 
 }  // namespace resource_provider
 
 #endif  // COMPONENTS_RESOURCE_PROVIDER_RESOURCE_PROVIDER_APP_H_