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

mash/example/views_examples/views_examples_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 "mash/example/views_examples/views_examples_application_delegate.h"
 
 #include "mojo/shell/public/cpp/application_connection.h"
-#include "mojo/shell/public/cpp/application_impl.h"
+#include "mojo/shell/public/cpp/shell.h"
 #include "ui/views/examples/example_base.h"
 #include "ui/views/examples/examples_window.h"
 #include "ui/views/mus/aura_init.h"
 #include "ui/views/mus/window_manager_connection.h"
 
 ViewsExamplesApplicationDelegate::ViewsExamplesApplicationDelegate() {}
 
 ViewsExamplesApplicationDelegate::~ViewsExamplesApplicationDelegate() {
 }
 
-void ViewsExamplesApplicationDelegate::Initialize(mojo::ApplicationImpl* app) {
-  tracing_.Initialize(app);
-  aura_init_.reset(new views::AuraInit(app, "views_mus_resources.pak"));
+void ViewsExamplesApplicationDelegate::Initialize(mojo::Shell* shell,
+                                                  const std::string& url,
+                                                  uint32_t id) {
+  tracing_.Initialize(shell, url);
+  aura_init_.reset(new views::AuraInit(shell, "views_mus_resources.pak"));
 
-  views::WindowManagerConnection::Create(app);
+  views::WindowManagerConnection::Create(shell);
 
   views::examples::ShowExamplesWindow(views::examples::DO_NOTHING_ON_CLOSE,
                                       nullptr, nullptr);
 }
 
 bool ViewsExamplesApplicationDelegate::AcceptConnection(
     mojo::ApplicationConnection* connection) {
   return false;
 }