Remove ASSERT_ARG().

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 245 matching lines @@
     DOMWindowSet::iterator it = set.find(domWindow);
     if (it == set.end())
         return;
     set.removeAll(it);
     if (set.isEmpty())
         updateSuddenTerminationStatus(domWindow, false, FrameLoaderClient::BeforeUnloadHandler);
 }
 
 static bool allowsBeforeUnloadListeners(LocalDOMWindow* window)
 {
-    ASSERT_ARG(window, window);
+    DCHECK(window);
     LocalFrame* frame = window->frame();
     if (!frame)
         return false;
     return frame->isMainFrame();
 }
 
 unsigned LocalDOMWindow::pendingUnloadEventListeners() const
 {
     return windowsWithUnloadEventListeners().count(const_cast<LocalDOMWindow*>(this));
 }
@@ skipping 1242 matching lines @@
 {
     // If the LocalDOMWindow still has a frame reference, that frame must point
     // back to this LocalDOMWindow: otherwise, it's easy to get into a situation
     // where script execution leaks between different LocalDOMWindows.
     if (m_frameObserver->frame())
         ASSERT_WITH_SECURITY_IMPLICATION(m_frameObserver->frame()->domWindow() == this);
     return m_frameObserver->frame();
 }
 
 } // namespace blink