Refators display related functionality into own class

components/mus/mus_app.h

 // 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.
 
 #ifndef COMPONENTS_MUS_MUS_APP_H_
 #define COMPONENTS_MUS_MUS_APP_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 51 matching lines @@
 
   void InitializeResources(mojo::Connector* connector);
 
   // mojo::ShellClient:
   void Initialize(mojo::Connector* connector, const std::string& url,
                   const std::string& user_id, uint32_t id) override;
   bool AcceptConnection(mojo::Connection* connection) override;
 
   // ConnectionManagerDelegate:
   void OnFirstDisplayReady() override;
-  void OnNoMoreRootConnections() override;
+  void OnNoMoreDisplays() override;
   scoped_ptr<ws::WindowTreeBinding> CreateWindowTreeBindingForEmbedAtWindow(
       ws::ConnectionManager* connection_manager,
       ws::WindowTree* tree,
       mojom::WindowTreeRequest tree_request,
       mojom::WindowTreeClientPtr client) override;
   void CreateDefaultDisplays() override;
 
   // mojo::InterfaceFactory<mojom::DisplayManager> implementation.
   void Create(mojo::Connection* connection,
               mojom::DisplayManagerRequest request) override;
@@ skipping 29 matching lines @@
 
   // Surfaces
   scoped_refptr<SurfacesState> surfaces_state_;
 
   DISALLOW_COPY_AND_ASSIGN(MandolineUIServicesApp);
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_MUS_APP_H_