Make EUserSelect an enum class.

third_party/WebKit/Source/core/editing/EditingUtilities.cpp

Index: third_party/WebKit/Source/core/editing/EditingUtilities.cpp
diff --git a/third_party/WebKit/Source/core/editing/EditingUtilities.cpp b/third_party/WebKit/Source/core/editing/EditingUtilities.cpp
index 72d667e651c7778f25c0c04a5c836b8b6a132737..cd692b49411d8bdebbd4da0a2724377b29214d9f 100644
--- a/third_party/WebKit/Source/core/editing/EditingUtilities.cpp
+++ b/third_party/WebKit/Source/core/editing/EditingUtilities.cpp
@@ -980,13 +980,13 @@ Element* EnclosingBlockFlowElement(const Node& node) {
 
 EUserSelect UsedValueOfUserSelect(const Node& node) {
   if (node.IsHTMLElement() && ToHTMLElement(node).IsTextControl())
-    return SELECT_TEXT;
+    return EUserSelect::kText;
   if (!node.GetLayoutObject())
-    return SELECT_NONE;
+    return EUserSelect::kNone;
 
   const ComputedStyle* style = node.GetLayoutObject()->Style();
   if (style->UserModify() != EUserModify::kReadOnly)
-    return SELECT_TEXT;
+    return EUserSelect::kText;
 
   return style->UserSelect();
 }