Bit-mask incorrectly removed first-line pseudo bit.

third_party/WebKit/Source/core/style/ComputedStyle.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 3772 matching lines @@
 
 inline bool ComputedStyle::setTextOrientation(TextOrientation textOrientation) {
   if (compareEqual(m_rareInheritedData->m_textOrientation, textOrientation))
     return false;
 
   m_rareInheritedData.access()->m_textOrientation = textOrientation;
   return true;
 }
 
 inline bool ComputedStyle::hasAnyPublicPseudoStyles() const {
-  return PublicPseudoIdMask & m_nonInheritedData.m_pseudoBits;
+  return m_nonInheritedData.m_pseudoBits;
 }
 
 inline bool ComputedStyle::hasPseudoStyle(PseudoId pseudo) const {
-  ASSERT(pseudo > PseudoIdNone);
-  ASSERT(pseudo < FirstInternalPseudoId);
-  return (1 << (pseudo - 1)) & m_nonInheritedData.m_pseudoBits;
+  DCHECK(pseudo >= FirstPublicPseudoId);
+  DCHECK(pseudo < FirstInternalPseudoId);
+  return (1 << (pseudo - FirstPublicPseudoId)) &
+         m_nonInheritedData.m_pseudoBits;
 }
 
 inline void ComputedStyle::setHasPseudoStyle(PseudoId pseudo) {
-  ASSERT(pseudo > PseudoIdNone);
-  ASSERT(pseudo < FirstInternalPseudoId);
-  m_nonInheritedData.m_pseudoBits |= 1 << (pseudo - 1);
+  DCHECK(pseudo >= FirstPublicPseudoId);
+  DCHECK(pseudo < FirstInternalPseudoId);
+  m_nonInheritedData.m_pseudoBits |= 1 << (pseudo - FirstPublicPseudoId);
 }
 
 inline bool ComputedStyle::hasPseudoElementStyle() const {
   return m_nonInheritedData.m_pseudoBits & ElementPseudoIdMask;
 }
 
 }  // namespace blink
 
 #endif  // ComputedStyle_h