Make RubyPosition an enum class.

third_party/WebKit/Source/core/layout/line/InlineFlowBox.cpp

Index: third_party/WebKit/Source/core/layout/line/InlineFlowBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/line/InlineFlowBox.cpp b/third_party/WebKit/Source/core/layout/line/InlineFlowBox.cpp
index 9a67e8adef0d8a109f9d150eea10464255e82b60..22a9d43673984f700edce2e21c5539880c530b1b 100644
--- a/third_party/WebKit/Source/core/layout/line/InlineFlowBox.cpp
+++ b/third_party/WebKit/Source/core/layout/line/InlineFlowBox.cpp
@@ -794,7 +794,7 @@ void InlineFlowBox::PlaceBoxesInBlockDirection(
         // been done as line layout and not done using inline-block.
         if (GetLineLayoutItem().Style()->IsFlippedLinesWritingMode() ==
             (curr->GetLineLayoutItem().Style()->GetRubyPosition() ==
-             kRubyPositionAfter))
+             RubyPosition::kAfter))
           has_annotations_before = true;
         else
           has_annotations_after = true;
@@ -1513,7 +1513,7 @@ LayoutUnit InlineFlowBox::ComputeOverAnnotationAdjustment(
     if (curr->GetLineLayoutItem().IsAtomicInlineLevel() &&
         curr->GetLineLayoutItem().IsRubyRun() &&
         curr->GetLineLayoutItem().Style()->GetRubyPosition() ==
-            kRubyPositionBefore) {
+            RubyPosition::kBefore) {
       LineLayoutRubyRun ruby_run = LineLayoutRubyRun(curr->GetLineLayoutItem());
       LineLayoutRubyText ruby_text = ruby_run.RubyText();
       if (!ruby_text)
@@ -1584,7 +1584,7 @@ LayoutUnit InlineFlowBox::ComputeUnderAnnotationAdjustment(
     if (curr->GetLineLayoutItem().IsAtomicInlineLevel() &&
         curr->GetLineLayoutItem().IsRubyRun() &&
         curr->GetLineLayoutItem().Style()->GetRubyPosition() ==
-            kRubyPositionAfter) {
+            RubyPosition::kAfter) {
       LineLayoutRubyRun ruby_run = LineLayoutRubyRun(curr->GetLineLayoutItem());
       LineLayoutRubyText ruby_text = ruby_run.RubyText();
       if (!ruby_text)