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

mash/task_viewer/task_viewer_application_delegate.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 MASH_TASK_VIEWER_TASK_VIEWER_APPLICATION_DELEGATE_H_
 #define MASH_TASK_VIEWER_TASK_VIEWER_APPLICATION_DELEGATE_H_
 
 #include <map>
 
 #include "base/callback.h"
@@ skipping 13 matching lines @@
 namespace mash {
 namespace task_viewer {
 
 class TaskViewerApplicationDelegate : public mojo::ApplicationDelegate {
  public:
   TaskViewerApplicationDelegate();
   ~TaskViewerApplicationDelegate() override;
 
  private:
   // mojo::ApplicationDelegate:
-  void Initialize(mojo::ApplicationImpl* app) override;
+  void Initialize(mojo::Shell* shell, const std::string& url,
+                  uint32_t id) override;
 
   mojo::TracingImpl tracing_;
   scoped_ptr<views::AuraInit> aura_init_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskViewerApplicationDelegate);
 };
 
 }  // namespace task_viewer
 }  // namespace mash
 
 #endif  // MASH_TASK_VIEWER_TASK_VIEWER_APPLICATION_DELEGATE_H_