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

mojo/shell/public/cpp/lib/content_handler_factory.cc

 // Copyright 2014 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 <set>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/platform_thread.h"
 #include "mojo/message_pump/message_pump_mojo.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "mojo/shell/public/cpp/application_connection.h"
-#include "mojo/shell/public/cpp/application_delegate.h"
-#include "mojo/shell/public/cpp/application_impl.h"
-#include "mojo/shell/public/cpp/application_runner.h"
 #include "mojo/shell/public/cpp/content_handler_factory.h"
 #include "mojo/shell/public/cpp/interface_factory_impl.h"
 
 namespace mojo {
 
 namespace {
 
 class ApplicationThread : public base::PlatformThread::Delegate {
  public:
   ApplicationThread(
@@ skipping 104 matching lines @@
     loop.Run();
 }
 
 void ContentHandlerFactory::Create(
     ApplicationConnection* connection,
     InterfaceRequest<shell::mojom::ContentHandler> request) {
   new ContentHandlerImpl(delegate_, std::move(request));
 }
 
 }  // namespace mojo