Make TextOrientation an enum class.

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

Index: third_party/WebKit/Source/core/css/resolver/FontBuilder.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/FontBuilder.cpp b/third_party/WebKit/Source/core/css/resolver/FontBuilder.cpp
index d62baafcc3913fb4a3014d448ee06b6ec9d61f08..56601c2ed71c0f35ca2f2c4cf688d47df229cb2e 100644
--- a/third_party/WebKit/Source/core/css/resolver/FontBuilder.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/FontBuilder.cpp
@@ -242,11 +242,11 @@ static FontOrientation ComputeFontOrientation(const ComputedStyle& style) {
     return FontOrientation::kHorizontal;
 
   switch (style.GetTextOrientation()) {
-    case kTextOrientationMixed:
+    case TextOrientation::kMixed:
       return FontOrientation::kVerticalMixed;
-    case kTextOrientationUpright:
+    case TextOrientation::kUpright:
       return FontOrientation::kVerticalUpright;
-    case kTextOrientationSideways:
+    case TextOrientation::kSideways:
       return FontOrientation::kVerticalRotated;
     default:
       NOTREACHED();