Remove DOMWindowProperty::willDetachGlobalObjectFromFrame

third_party/WebKit/Source/core/frame/DOMWindowProperty.cpp

 /*
  * Copyright (C) 2011 Google, Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 34 matching lines @@
 }
 
 void DOMWindowProperty::willDestroyGlobalObjectInFrame()
 {
     // If the property is getting this callback it must have been
     // created with a LocalFrame and it should still have it.
     ASSERT(m_frame);
     m_frame = nullptr;
 }
 
-void DOMWindowProperty::willDetachGlobalObjectFromFrame()
-{
-    // If the property is getting this callback it must have been
-    // created with a LocalFrame and it should still have it.
-    ASSERT(m_frame);
-}
-
 DEFINE_TRACE(DOMWindowProperty)
 {
     visitor->trace(m_frame);
 }
 
 } // namespace blink