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

components/web_view/web_view_application_delegate.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/web_view/web_view_application_delegate.h"
 
 #include <utility>
 
 #include "components/web_view/web_view_impl.h"
 #include "mojo/shell/public/cpp/application_connection.h"
 
 namespace web_view {
 
-WebViewApplicationDelegate::WebViewApplicationDelegate() : app_(nullptr) {}
+WebViewApplicationDelegate::WebViewApplicationDelegate() : shell_(nullptr) {}
 WebViewApplicationDelegate::~WebViewApplicationDelegate() {}
 
-void WebViewApplicationDelegate::Initialize(mojo::ApplicationImpl* app) {
-  app_ = app;
-  tracing_.Initialize(app);
+void WebViewApplicationDelegate::Initialize(mojo::Shell* shell,
+                                            const std::string& url,
+                                            uint32_t id) {
+  shell_ = shell;
+  tracing_.Initialize(shell, url);
 }
 
 bool WebViewApplicationDelegate::AcceptConnection(
     mojo::ApplicationConnection* connection) {
   connection->AddService<mojom::WebViewFactory>(this);
   return true;
 }
 
 void WebViewApplicationDelegate::CreateWebView(
     mojom::WebViewClientPtr client,
     mojo::InterfaceRequest<mojom::WebView> web_view) {
-  new WebViewImpl(app_, std::move(client), std::move(web_view));
+  new WebViewImpl(shell_, std::move(client), std::move(web_view));
 }
 
 void WebViewApplicationDelegate::Create(
     mojo::ApplicationConnection* connection,
     mojo::InterfaceRequest<mojom::WebViewFactory> request) {
   factory_bindings_.AddBinding(this, std::move(request));
 }
 
 }  // namespace web_view