mojo: Make InterfacePtr<> testable in if() statements without .get().

mojo/views/native_widget_view_manager.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 "mojo/views/native_widget_view_manager.h"
 
 #include "mojo/aura/window_tree_host_mojo.h"
 #include "mojo/services/public/cpp/input_events/input_events_type_converters.h"
 #include "mojo/services/public/cpp/view_manager/view.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 144 matching lines @@
   if (old_view)
     old_view->RemoveObserver(this);
   if (new_view)
     new_view->AddObserver(this);
   view_ = new_view;
 }
 
 void NativeWidgetViewManager::OnViewInputEvent(view_manager::View* view,
                                                const EventPtr& event) {
   scoped_ptr<ui::Event> ui_event(event.To<scoped_ptr<ui::Event> >());
-  if (ui_event.get())
+  if (ui_event)
     window_tree_host_->SendEventToProcessor(ui_event.get());
 }
 
 void NativeWidgetViewManager::OnViewDestroyed(view_manager::View* view) {
   DCHECK_EQ(view, view_);
   view->RemoveObserver(this);
   view_ = NULL;
 }
 
 }  // namespace mojo