Rename RootViewManager to DisplayManager

mojo/services/view_manager/display_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 MOJO_SERVICES_VIEW_MANAGER_ROOT_VIEW_MANAGER_DELEGATE_H_
-#define MOJO_SERVICES_VIEW_MANAGER_ROOT_VIEW_MANAGER_DELEGATE_H_
+#ifndef MOJO_SERVICES_VIEW_MANAGER_DISPLAY_MANAGER_DELEGATE_H_
+#define MOJO_SERVICES_VIEW_MANAGER_DISPLAY_MANAGER_DELEGATE_H_
 
 #include "mojo/services/view_manager/view_manager_export.h"
 
 namespace mojo {
 namespace service {
 
-class MOJO_VIEW_MANAGER_EXPORT RootViewManagerDelegate {
+class MOJO_VIEW_MANAGER_EXPORT DisplayManagerDelegate {
  public:
   // Invoked when the WindowTreeHost is ready.
-  virtual void OnRootViewManagerWindowTreeHostCreated() = 0;
+  virtual void OnDisplayManagerWindowTreeHostCreated() = 0;
 
  protected:
-  virtual ~RootViewManagerDelegate() {}
+  virtual ~DisplayManagerDelegate() {}
 };
 
 }  // namespace service
 }  // namespace mojo
 
-#endif  // MOJO_SERVICES_VIEW_MANAGER_ROOT_VIEW_MANAGER_H_
+#endif  // MOJO_SERVICES_VIEW_MANAGER_DISPLAY_MANAGER_DELEGATE_H_