[LayoutNG] Fix enum values to conform to kEnumName in style guide.

third_party/WebKit/Source/core/layout/ng/ng_writing_mode.cc

Index: third_party/WebKit/Source/core/layout/ng/ng_writing_mode.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_writing_mode.cc b/third_party/WebKit/Source/core/layout/ng/ng_writing_mode.cc
index 3056abacf3957f3290145faac4fba50e593792be..6d7a15034b11ea4fa230a77465119e444b9bc005 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_writing_mode.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_writing_mode.cc
@@ -12,14 +12,14 @@ namespace blink {
 NGWritingMode FromPlatformWritingMode(WritingMode mode) {
   switch (mode) {
     case TopToBottomWritingMode:
-      return HorizontalTopBottom;
+      return kHorizontalTopBottom;
     case RightToLeftWritingMode:
-      return VerticalRightLeft;
+      return kVerticalRightLeft;
     case LeftToRightWritingMode:
-      return VerticalLeftRight;
+      return kVerticalLeftRight;
     default:
       NOTREACHED();
-      return HorizontalTopBottom;
+      return kHorizontalTopBottom;
   }
 }