Purge UnspecifiedBoolType from Blink.

third_party/WebKit/Source/core/layout/api/LineLayoutItem.h

 // Copyright 2015 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.
 
 #ifndef LineLayoutItem_h
 #define LineLayoutItem_h
 
 #include "core/layout/LayoutObject.h"
 #include "core/layout/LayoutObjectInlines.h"
 
@@ skipping 29 matching lines @@
     {
     }
 
     LineLayoutItem(std::nullptr_t)
         : m_layoutObject(0)
     {
     }
 
     LineLayoutItem() : m_layoutObject(0) { }
 
-    typedef LayoutObject* LineLayoutItem::*UnspecifiedBoolType;
-    operator UnspecifiedBoolType() const { return m_layoutObject ? &LineLayoutItem::m_layoutObject : nullptr; }
+    explicit operator bool() const { return m_layoutObject; }
 
     bool isEqual(const LayoutObject* layoutObject) const
     {
         return m_layoutObject == layoutObject;
     }
 
     bool operator==(const LineLayoutItem& other) const
     {
         return m_layoutObject == other.m_layoutObject;
     }
@@ skipping 434 matching lines @@
 
 template <>
 struct HashTraits<blink::LineLayoutItem> : SimpleClassHashTraits<blink::LineLayoutItem> {
     STATIC_ONLY(HashTraits);
 };
 
 } // namespace WTF
 
 
 #endif // LineLayoutItem_h