Allow explicit conversion operators and implement WTF::OwnPtr::operator bool.

third_party/WebKit/Source/core/layout/LayoutBox.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 831 matching lines @@
     // These represent your location relative to your container as a physical offset.
     // In layout related methods you almost always want the logical location (e.g. x() and y()).
     LayoutPoint topLeftLocation() const;
     LayoutSize topLeftLocationOffset() const { return toLayoutSize(topLeftLocation()); }
 
     LayoutRect logicalVisualOverflowRectForPropagation(const ComputedStyle&) const;
     LayoutRect visualOverflowRectForPropagation(const ComputedStyle&) const;
     LayoutRect logicalLayoutOverflowRectForPropagation(const ComputedStyle&) const;
     LayoutRect layoutOverflowRectForPropagation(const ComputedStyle&) const;
 
-    bool hasOverflowModel() const { return m_overflow; }
+    bool hasOverflowModel() const { return m_overflow.get(); }
     bool hasVisualOverflow() const { return m_overflow && !borderBoxRect().contains(m_overflow->visualOverflowRect()); }
 
     virtual bool needsPreferredWidthsRecalculation() const;
 
     IntSize scrolledContentOffset() const;
 
     // Maps a rect in scrolling contents space to box space and apply overflow clip if needed.
     // Returns true if no clipping applied or the rect actually intersects the clipping region.
     // If edgeInclusive is true, then this method may return true even
     // if the resulting rect has zero area.
@@ skipping 297 matching lines @@
         || breakValue == BreakLeft
         || breakValue == BreakPage
         || breakValue == BreakRecto
         || breakValue == BreakRight
         || breakValue == BreakVerso;
 }
 
 } // namespace blink
 
 #endif // LayoutBox_h