Revert of Quit the message loop by default in ShellConnectionLost when ApplicationRunner is used

mash/wm/window_manager_application.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_WM_WINDOW_MANAGER_APPLICATION_H_
 #define MASH_WM_WINDOW_MANAGER_APPLICATION_H_
 
 #include <stdint.h>
 
 #include <set>
@@ skipping 72 matching lines @@
     return session_.get();
   }
 
  private:
   void OnAcceleratorRegistrarDestroyed(AcceleratorRegistrarImpl* registrar);
 
   // mojo::ShellClient:
   void Initialize(mojo::Connector* connector, const mojo::Identity& identity,
                   uint32_t id) override;
   bool AcceptConnection(mojo::Connection* connection) override;
+  void ShellConnectionLost() override;
 
   // InterfaceFactory<mash::wm::mojom::UserWindowController>:
   void Create(mojo::Connection* connection,
               mojo::InterfaceRequest<mash::wm::mojom::UserWindowController>
                   request) override;
 
   // InterfaceFactory<mus::mojom::AcceleratorRegistrar>:
   void Create(mojo::Connection* connection,
               mojo::InterfaceRequest<mus::mojom::AcceleratorRegistrar> request)
       override;
@@ skipping 29 matching lines @@
 
   base::ObserverList<RootWindowsObserver> root_windows_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerApplication);
 };
 
 }  // namespace wm
 }  // namespace mash
 
 #endif  // MASH_WM_WINDOW_MANAGER_APPLICATION_H_