Replace ENABLE(ASSERT) with DCHECK_IS_ON().

third_party/WebKit/Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
    reserved.
 
    This library is free software; you can redistribute it and/or
@@ skipping 1073 matching lines @@
   IntSize m_layoutSize;
   IntSize m_initialViewportSize;
   bool m_layoutSizeFixedToFrameSize;
 
   Timer<FrameView> m_didScrollTimer;
 
   Vector<IntRect> m_tickmarks;
 
   bool m_needsUpdateWidgetGeometries;
 
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
   // Verified when finalizing.
-  bool m_hasBeenDisposed;
+  bool m_hasBeenDisposed = false;
 #endif
 
   ScrollbarMode m_horizontalScrollbarMode;
   ScrollbarMode m_verticalScrollbarMode;
 
   bool m_horizontalScrollbarLock;
   bool m_verticalScrollbarLock;
 
   ChildrenWidgetSet m_children;
 
@@ skipping 116 matching lines @@
                   widget.isFrameView());
 DEFINE_TYPE_CASTS(FrameView,
                   ScrollableArea,
                   scrollableArea,
                   scrollableArea->isFrameView(),
                   scrollableArea.isFrameView());
 
 }  // namespace blink
 
 #endif  // FrameView_h