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

components/resource_provider/resource_provider_app.cc

 // 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.
 
 #include "components/resource_provider/resource_provider_app.h"
 
 #include <utility>
 
 #include "components/resource_provider/file_utils.h"
 #include "components/resource_provider/resource_provider_impl.h"
 #include "mojo/shell/public/cpp/application_connection.h"
 #include "url/gurl.h"
 
 namespace resource_provider {
 
 ResourceProviderApp::ResourceProviderApp(
     const std::string& resource_provider_app_url)
     : resource_provider_app_url_(resource_provider_app_url) {
 }
 
 ResourceProviderApp::~ResourceProviderApp() {
 }
 
-void ResourceProviderApp::Initialize(mojo::ApplicationImpl* app) {
-  tracing_.Initialize(app);
+void ResourceProviderApp::Initialize(mojo::Shell* shell, const std::string& url,
+                                     uint32_t id) {
+  tracing_.Initialize(shell, url);
 }
 
 bool ResourceProviderApp::AcceptConnection(
     mojo::ApplicationConnection* connection) {
   const base::FilePath app_path(
       GetPathForApplicationUrl(connection->GetRemoteApplicationURL()));
   if (app_path.empty())
     return false;  // The specified app has no resources.
 
   connection->AddService<ResourceProvider>(this);
   return true;
 }
 
 void ResourceProviderApp::Create(
     mojo::ApplicationConnection* connection,
     mojo::InterfaceRequest<ResourceProvider> request) {
   const base::FilePath app_path(
       GetPathForApplicationUrl(connection->GetRemoteApplicationURL()));
   // We validated path at AcceptConnection() time, so it should still
   // be valid.
   CHECK(!app_path.empty());
   bindings_.AddBinding(
       new ResourceProviderImpl(app_path, resource_provider_app_url_),
       std::move(request));
 }
 
 }  // namespace resource_provider