Make TextUnderlinePosition an enum class.

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 230 matching lines @@
 inline TextDecorationSkip operator|(TextDecorationSkip a,
                                     TextDecorationSkip b) {
   return TextDecorationSkip(static_cast<unsigned>(a) |
                             static_cast<unsigned>(b));
 }
 inline TextDecorationSkip& operator|=(TextDecorationSkip& a,
                                       TextDecorationSkip b) {
   return a = a | b;
 }
 
-enum TextUnderlinePosition {
+enum class TextUnderlinePosition {
   // FIXME: Implement support for 'under left' and 'under right' values.
-  kTextUnderlinePositionAuto,
-  kTextUnderlinePositionUnder
+  kAuto,
+  kUnder
 };
 
 enum ETransformStyle3D { kTransformStyle3DFlat, kTransformStyle3DPreserve3D };
 
 enum OffsetRotationType { kOffsetRotationAuto, kOffsetRotationFixed };
 
 enum EBackfaceVisibility {
   kBackfaceVisibilityVisible,
   kBackfaceVisibilityHidden
 };
@@ skipping 159 matching lines @@
 // fraction, which leaves 20 bits for the integer part, making 1048575
 // the largest number.
 
 static const int kBorderWidthFractionalBits = 6;
 static const int kBorderWidthDenominator = 1 << kBorderWidthFractionalBits;
 static const int kMaxForBorderWidth = ((1 << 26) - 1) / kBorderWidthDenominator;
 
 }  // namespace blink
 
 #endif  // ComputedStyleConstants_h