Make EBoxDecorationBreak 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 98 matching lines @@
 enum OutlineIsAuto { kOutlineIsAutoOff = 0, kOutlineIsAutoOn };
 
 enum EMarginCollapse {
   kMarginCollapseCollapse,
   kMarginCollapseSeparate,
   kMarginCollapseDiscard
 };
 
 // Box decoration attributes. Not inherited.
 
-enum EBoxDecorationBreak { kBoxDecorationBreakSlice, kBoxDecorationBreakClone };
+enum class EBoxDecorationBreak { kSlice, kClone };
 
 // Box attributes. Not inherited.
 
 enum class EBoxSizing : unsigned { kContentBox, kBorderBox };
 
 // Random visual rendering model attributes. Not inherited.
 
 enum class EVerticalAlign : unsigned {
   kBaseline,
   kMiddle,
@@ skipping 365 matching lines @@
   kScrollSnapTypeNone,
   kScrollSnapTypeMandatory,
   kScrollSnapTypeProximity
 };
 
 enum AutoRepeatType { kNoAutoRepeat, kAutoFill, kAutoFit };
 
 }  // namespace blink
 
 #endif  // ComputedStyleConstants_h