Fix ownership bug with ViewObserver::OnViewInputEvent

mojo/examples/embedded_app/embedded_app.cc

 // 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.
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "mojo/examples/window_manager/window_manager.mojom.h"
 #include "mojo/public/cpp/application/application.h"
 #include "mojo/services/public/cpp/view_manager/view.h"
 #include "mojo/services/public/cpp/view_manager/view_manager.h"
@@ skipping 48 matching lines @@
   }
   virtual void OnRootRemoved(ViewManager* view_manager,
                              ViewTreeNode* root) OVERRIDE {
     std::map<ViewTreeNode*, View*>::const_iterator it =
         views_to_reap_.find(root);
     if (it != views_to_reap_.end())
       it->second->Destroy();
   }
 
   // Overridden from ViewObserver:
-  virtual void OnViewInputEvent(View* view, EventPtr event) OVERRIDE {
+  virtual void OnViewInputEvent(View* view, const EventPtr& event) OVERRIDE {
     if (event->action == ui::ET_MOUSE_RELEASED)
       window_manager_->CloseWindow(view->node()->id());
   }
 
   // Overridden from ViewTreeNodeObserver:
   virtual void OnNodeActiveViewChange(
       ViewTreeNode* node,
       View* old_view,
       View* new_view,
       ViewTreeNodeObserver::DispositionChangePhase phase) OVERRIDE {
     if (new_view == 0)
       views_to_reap_[node] = old_view;
   }
 
   IWindowManagerPtr window_manager_;
   std::map<ViewTreeNode*, View*> views_to_reap_;
 
   DISALLOW_COPY_AND_ASSIGN(EmbeddedApp);
 };
 
 }  // namespace examples
 
 // static
 Application* Application::Create() {
   return new examples::EmbeddedApp;
 }
 
-}  // namespace mojo
+}  // namespace mojo