Make TextEmphasisMark an enum class.

third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp

Index: third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp b/third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp
index 4e4952e15bfca66398f03db8f57db6a0ad0b09cb..03ac83baac4848833662c3a572772da665c5927c 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp
@@ -613,7 +613,7 @@ void StyleBuilderFunctions::applyValueCSSPropertyWebkitTextEmphasisStyle(
 
   if (value.IsStringValue()) {
     state.Style()->SetTextEmphasisFill(TextEmphasisFill::kFilled);
-    state.Style()->SetTextEmphasisMark(kTextEmphasisMarkCustom);
+    state.Style()->SetTextEmphasisMark(TextEmphasisMark::kCustom);
     state.Style()->SetTextEmphasisCustomMark(
         AtomicString(ToCSSStringValue(value).Value()));
     return;
@@ -627,7 +627,7 @@ void StyleBuilderFunctions::applyValueCSSPropertyWebkitTextEmphasisStyle(
       identifier_value.GetValueID() == CSSValueOpen) {
     state.Style()->SetTextEmphasisFill(
         identifier_value.ConvertTo<TextEmphasisFill>());
-    state.Style()->SetTextEmphasisMark(kTextEmphasisMarkAuto);
+    state.Style()->SetTextEmphasisMark(TextEmphasisMark::kAuto);
   } else {
     state.Style()->SetTextEmphasisFill(TextEmphasisFill::kFilled);
     state.Style()->SetTextEmphasisMark(