Nukes view_manager namespace

mojo/services/view_manager/root_view_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_
 
 #include "mojo/services/view_manager/view_manager_export.h"
 
 namespace mojo {
-namespace view_manager {
 namespace service {
 
 class MOJO_VIEW_MANAGER_EXPORT RootViewManagerDelegate {
  public:
   // Invoked when the WindowTreeHost is ready.
   virtual void OnRootViewManagerWindowTreeHostCreated() = 0;
 
  protected:
   virtual ~RootViewManagerDelegate() {}
 };
 
 }  // namespace service
-}  // namespace view_manager
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_VIEW_MANAGER_ROOT_VIEW_MANAGER_H_