Make ESpeak an enum class.

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

Index: third_party/WebKit/Source/core/style/ComputedStyleConstants.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyleConstants.h b/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
index 0a825a3c908de63639cb9b1d43d06ed2bedc2b3b..bfd311e748bd8999e4d9ea1bd478feaa037dbc2a 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
@@ -319,13 +319,13 @@ enum ELineClampType { kLineClampLineCount, kLineClampPercentage };
 
 enum Hyphens { kHyphensNone, kHyphensManual, kHyphensAuto };
 
-enum ESpeak {
-  kSpeakNone,
-  kSpeakNormal,
-  kSpeakSpellOut,
-  kSpeakDigits,
-  kSpeakLiteralPunctuation,
-  kSpeakNoPunctuation
+enum class ESpeak {
+  kNone,
+  kNormal,
+  kSpellOut,
+  kDigits,
+  kLiteralPunctuation,
+  kNoPunctuation
 };
 
 enum TextEmphasisFill { kTextEmphasisFillFilled, kTextEmphasisFillOpen };