Make TextEmphasisPosition an enum class.

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

Index: third_party/WebKit/Source/core/style/ComputedStyle.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.h b/third_party/WebKit/Source/core/style/ComputedStyle.h
index 43a50f38e72e63e93ccdbaceed4dc926c299b7ea..d7dcd8de2c52c335b649ad47eaebe5506ee724e2 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.h
@@ -1781,14 +1781,15 @@ class CORE_EXPORT ComputedStyle : public ComputedStyleBase<ComputedStyle>,
 
   // -webkit-text-emphasis-position
   static TextEmphasisPosition InitialTextEmphasisPosition() {
-    return kTextEmphasisPositionOver;
+    return TextEmphasisPosition::kOver;
   }
   TextEmphasisPosition GetTextEmphasisPosition() const {
     return static_cast<TextEmphasisPosition>(
         rare_inherited_data_->text_emphasis_position_);
   }
   void SetTextEmphasisPosition(TextEmphasisPosition position) {
-    SET_VAR(rare_inherited_data_, text_emphasis_position_, position);
+    SET_VAR(rare_inherited_data_, text_emphasis_position_,
+            static_cast<unsigned>(position));
   }
 
   // -webkit-highlight