Make TextAlignLast 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 344ae1ae80e7997ce12e3114026ed11ca6f8676f..5376d2597a3309b0fb00bc2e32904ff9c609e2b3 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
@@ -248,14 +248,14 @@ inline TextDecorationSkip& operator|=(TextDecorationSkip& a,
   return a = a | b;
 }
 
-enum TextAlignLast {
-  kTextAlignLastAuto,
-  kTextAlignLastStart,
-  kTextAlignLastEnd,
-  kTextAlignLastLeft,
-  kTextAlignLastRight,
-  kTextAlignLastCenter,
-  kTextAlignLastJustify
+enum class TextAlignLast {
+  kAuto,
+  kStart,
+  kEnd,
+  kLeft,
+  kRight,
+  kCenter,
+  kJustify
 };
 
 enum TextUnderlinePosition {