Make RubyPosition 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 309 matching lines @@
 enum TextOverflow { kTextOverflowClip = 0, kTextOverflowEllipsis };
 
 enum EImageRendering {
   kImageRenderingAuto,
   kImageRenderingOptimizeSpeed,
   kImageRenderingOptimizeQuality,
   kImageRenderingOptimizeContrast,
   kImageRenderingPixelated
 };
 
-enum RubyPosition { kRubyPositionBefore, kRubyPositionAfter };
+enum class RubyPosition { kBefore, kAfter };
 
 static const size_t kGridAutoFlowBits = 4;
 enum InternalGridAutoFlowAlgorithm {
   kInternalAutoFlowAlgorithmSparse = 0x1,
   kInternalAutoFlowAlgorithmDense = 0x2
 };
 
 enum InternalGridAutoFlowDirection {
   kInternalAutoFlowDirectionRow = 0x4,
   kInternalAutoFlowDirectionColumn = 0x8
@@ skipping 112 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