Bit-mask incorrectly removed first-line pseudo bit.

third_party/WebKit/Source/core/style/ComputedStyleConstants.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 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  *
@@ skipping 64 matching lines @@
   PseudoIdScrollbarButton,
   PseudoIdScrollbarTrack,
   PseudoIdScrollbarTrackPiece,
   PseudoIdScrollbarCorner,
   PseudoIdResizer,
   PseudoIdInputListButton,
   // Special values follow:
   AfterLastInternalPseudoId,
   FirstPublicPseudoId = PseudoIdFirstLine,
   FirstInternalPseudoId = PseudoIdScrollbarThumb,
-  PublicPseudoIdMask =
-      ((1 << FirstInternalPseudoId) - 1) & ~((1 << FirstPublicPseudoId) - 1),
-  ElementPseudoIdMask = (1 << (PseudoIdBefore - 1)) |
-                        (1 << (PseudoIdAfter - 1)) |
-                        (1 << (PseudoIdBackdrop - 1))
+  ElementPseudoIdMask = (1 << (PseudoIdBefore - FirstPublicPseudoId)) |
+                        (1 << (PseudoIdAfter - FirstPublicPseudoId)) |
+                        (1 << (PseudoIdBackdrop - FirstPublicPseudoId))
 };
 
 enum ColumnFill { ColumnFillBalance, ColumnFillAuto };
 
 enum ColumnSpan { ColumnSpanNone = 0, ColumnSpanAll };
 
 // These have been defined in the order of their precedence for
 // border-collapsing. Do not change this order! This order also must match the
 // order in CSSValueKeywords.in.
 enum EBorderStyle {
@@ skipping 468 matching lines @@
   ScrollSnapTypeNone,
   ScrollSnapTypeMandatory,
   ScrollSnapTypeProximity
 };
 
 enum AutoRepeatType { NoAutoRepeat, AutoFill, AutoFit };
 
 }  // namespace blink
 
 #endif  // ComputedStyleConstants_h