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

mandoline/services/updater/updater_impl.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 MANDOLINE_SERVICES_UPDATER_UPDATER_IMPL_H_
 #define MANDOLINE_SERVICES_UPDATER_UPDATER_IMPL_H_
 
 #include "base/macros.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "mojo/services/updater/updater.mojom.h"
 #include "mojo/shell/public/cpp/application_impl.h"
 
 namespace updater {
 
-class ApplicationImpl;
 class UpdaterApp;
 
 class UpdaterImpl : public Updater {
  public:
-  UpdaterImpl(mojo::ApplicationImpl* app_impl,
-              UpdaterApp* application,
+  UpdaterImpl(UpdaterApp* application,
               mojo::InterfaceRequest<Updater> request);
   ~UpdaterImpl() override;
 
   // Updater implementation:
   void GetPathForApp(const mojo::String& url,
                      const Updater::GetPathForAppCallback& callback) override;
 
  private:
   UpdaterApp* const application_;
-  mojo::ApplicationImpl* const app_impl_;
   mojo::StrongBinding<Updater> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(UpdaterImpl);
 };
 
 }  // namespace updater
 
 #endif  // MANDOLINE_SERVICES_UPDATER_UPDATER_IMPL_H_