Purge UnspecifiedBoolType from Blink.

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

 // Copyright 2016 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 LayoutItem_h
 #define LayoutItem_h
 
 #include "core/inspector/InspectorTraceEvents.h"
 #include "core/layout/LayoutObject.h"
 
@@ skipping 14 matching lines @@
     {
     }
 
     LayoutItem(std::nullptr_t)
         : m_layoutObject(0)
     {
     }
 
     LayoutItem() : m_layoutObject(0) { }
 
-    // TODO(leviw): This should be an UnspecifiedBoolType, but
+    // TODO(leviw): This should be "explicit operator bool", but
     // using this operator allows the API to be landed in pieces.
     // https://crbug.com/499321
     operator LayoutObject*() const { return m_layoutObject; }
 
-    // TODO(pilgrim): Remove this when we replace the operator above with UnspecifiedBoolType.
+    // TODO(pilgrim): Remove this when we replace the operator above with
+    // operator bool.
     bool isNull() const
     {
         return !m_layoutObject;
     }
 
     String debugName() const
     {
         return m_layoutObject->debugName();
     }
 
@@ skipping 248 matching lines @@
 
 private:
     LayoutObject* m_layoutObject;
 
     friend class LayoutAPIShim;
 };
 
 } // namespace blink
 
 #endif // LayoutItem_h