Mandoline UI Process: Update namespaces and file names

components/mus/focus_controller_delegate.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 COMPONENTS_MUS_FOCUS_CONTROLLER_DELEGATE_H_
 #define COMPONENTS_MUS_FOCUS_CONTROLLER_DELEGATE_H_
 
-namespace view_manager {
+namespace mus {
 
 class ServerView;
 
 class FocusControllerDelegate {
  public:
   virtual void OnFocusChanged(ServerView* old_focused_view,
                               ServerView* new_focused_view) = 0;
 
  protected:
   ~FocusControllerDelegate() {}
 };
 
-}  // namespace view_manager
+}  // namespace mus
 
 #endif  // COMPONENTS_MUS_FOCUS_CONTROLLER_DELEGATE_H_