Revert of Pass task runners to AudioManager constructor.

media/mojo/services/mojo_media_application.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 "media/mojo/services/mojo_media_application.h"
 
 #include <utility>
 
 #include "media/base/media_log.h"
 #include "media/mojo/services/mojo_media_client.h"
@@ skipping 19 matching lines @@
                                       uint32_t /* id */) {
   connector_ = connector;
   mojo_media_client_->Initialize();
 }
 
 bool MojoMediaApplication::AcceptConnection(shell::Connection* connection) {
   connection->AddInterface<interfaces::ServiceFactory>(this);
   return true;
 }
 
-bool MojoMediaApplication::ShellConnectionLost() {
-  mojo_media_client_->WillQuit();
-  return true;
-}
-
 void MojoMediaApplication::Create(
     shell::Connection* connection,
     mojo::InterfaceRequest<interfaces::ServiceFactory> request) {
   // The created object is owned by the pipe.
   new ServiceFactoryImpl(std::move(request), connection->GetRemoteInterfaces(),
                          media_log_, ref_factory_.CreateRef(),
                          mojo_media_client_.get());
 }
 
 }  // namespace media