Refators display related functionality into own class

components/mus/ws/connection_manager_delegate.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_WS_CONNECTION_MANAGER_DELEGATE_H_
 #define COMPONENTS_MUS_WS_CONNECTION_MANAGER_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 17 matching lines @@
 class Display;
 class ServerWindow;
 class WindowTree;
 class WindowTreeBinding;
 
 class ConnectionManagerDelegate {
  public:
   // Called once when the AcceleratedWidget of a Display is available.
   virtual void OnFirstDisplayReady();
 
-  virtual void OnNoMoreRootConnections() = 0;
+  virtual void OnNoMoreDisplays() = 0;
 
   // Creates a WindowTreeBinding in response to Embed() calls on the
   // ConnectionManager.
   virtual scoped_ptr<WindowTreeBinding> CreateWindowTreeBindingForEmbedAtWindow(
       ws::ConnectionManager* connection_manager,
       ws::WindowTree* tree,
       mojom::WindowTreeRequest tree_request,
       mojom::WindowTreeClientPtr client) = 0;
 
   // Called if no Displays have been created, but a WindowManagerFactory has
   // been set.
   virtual void CreateDefaultDisplays() = 0;
 
  protected:
   virtual ~ConnectionManagerDelegate() {}
 };
 
 }  // namespace ws
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_CONNECTION_MANAGER_DELEGATE_H_