Make SelectionState enum class

third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
index 51a1cea171c8544251f3017e80ffe89a402ceabe..e4cf1d4df8875484e642f5cfb09d189d56563d0a 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
@@ -117,12 +117,15 @@ typedef HashMap<const LayoutBoxModelObject*, LayoutBoxModelObject*>
 static ContinuationMap* g_continuation_map = nullptr;
 
 void LayoutBoxModelObject::SetSelectionState(SelectionState state) {
-  if (state == SelectionInside && GetSelectionState() != SelectionNone)
+  if (state == SelectionState::kInside &&
+      GetSelectionState() != SelectionState::kNone)
     return;
 
-  if ((state == SelectionStart && GetSelectionState() == SelectionEnd) ||
-      (state == SelectionEnd && GetSelectionState() == SelectionStart))
-    LayoutObject::SetSelectionState(SelectionBoth);
+  if ((state == SelectionState::kStart &&
+       GetSelectionState() == SelectionState::kEnd) ||
+      (state == SelectionState::kEnd &&
+       GetSelectionState() == SelectionState::kStart))
+    LayoutObject::SetSelectionState(SelectionState::kStartAndEnd);
   else
     LayoutObject::SetSelectionState(state);