Revert 270122 "Synchronizes View instances across clients."

trunk/src/mojo/services/public/cpp/view_manager/view_observer.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_PUBLIC_CPP_VIEW_MANAGER_VIEW_OBSERVER_H_
-#define MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_OBSERVER_H_
-
-#include <vector>
-
-#include "base/basictypes.h"
-
-namespace mojo {
-namespace services {
-namespace view_manager {
-
-class View;
-
-class ViewObserver {
- public:
-  enum DispositionChangePhase {
-    DISPOSITION_CHANGING,
-    DISPOSITION_CHANGED
-  };
-
-  virtual void OnViewDestroy(View* view, DispositionChangePhase phase) {}
-
- protected:
-  virtual ~ViewObserver() {}
-};
-
-}  // namespace view_manager
-}  // namespace services
-}  // namespace mojo
-
-#endif  // MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_OBSERVER_H_