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

components/devtools_service/devtools_service.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/devtools_service/devtools_service.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "components/devtools_service/devtools_http_server.h"
-#include "mojo/shell/public/cpp/application_impl.h"
+#include "mojo/shell/public/cpp/shell.h"
 
 namespace devtools_service {
 
-DevToolsService::DevToolsService(mojo::ApplicationImpl* application)
-    : application_(application), registry_(this) {
-  DCHECK(application_);
+DevToolsService::DevToolsService(mojo::Shell* shell)
+    : shell_(shell), registry_(this) {
+  DCHECK(shell_);
 }
 
 DevToolsService::~DevToolsService() {
 }
 
 void DevToolsService::BindToCoordinatorRequest(
     mojo::InterfaceRequest<DevToolsCoordinator> request) {
   coordinator_bindings_.AddBinding(this, std::move(request));
 }
 
 void DevToolsService::Initialize(uint16_t remote_debugging_port) {
   if (http_server_) {
     LOG(WARNING) << "DevTools service receives a "
                  << "DevToolsCoordinator.Initialize() call while it has "
                  << "already been initialized.";
     return;
   }
 
   http_server_.reset(new DevToolsHttpServer(this, remote_debugging_port));
 }
 
 }  // namespace devtools_service