Move SelectionState out of LayoutObject and into Line Layout API

Source/core/layout/LayoutBlockFlow.cpp

Index: Source/core/layout/LayoutBlockFlow.cpp
diff --git a/Source/core/layout/LayoutBlockFlow.cpp b/Source/core/layout/LayoutBlockFlow.cpp
index 8dd973bf8d1c41917ee1f604a178d51012ac365d..05a8d13e5a314e1a880ae1f34bce3c4fbec01e31 100644
--- a/Source/core/layout/LayoutBlockFlow.cpp
+++ b/Source/core/layout/LayoutBlockFlow.cpp
@@ -45,6 +45,7 @@
 #include "core/layout/LayoutText.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/TextAutosizer.h"
+#include "core/layout/api/SelectionState.h"
 #include "core/layout/line/LineBreaker.h"
 #include "core/layout/line/LineWidth.h"
 #include "core/layout/shapes/ShapeOutsideInfo.h"
@@ -2866,12 +2867,12 @@ LayoutRect LayoutBlockFlow::logicalRightSelectionGap(const LayoutBlock* rootBloc
 void LayoutBlockFlow::getSelectionGapInfo(SelectionState state, bool& leftGap, bool& rightGap) const
 {
     bool ltr = style()->isLeftToRightDirection();
-    leftGap = (state == LayoutObject::SelectionInside)
-        || (state == LayoutObject::SelectionEnd && ltr)
-        || (state == LayoutObject::SelectionStart && !ltr);
-    rightGap = (state == LayoutObject::SelectionInside)
-        || (state == LayoutObject::SelectionStart && ltr)
-        || (state == LayoutObject::SelectionEnd && !ltr);
+    leftGap = (state == SelectionInside)
+        || (state == SelectionEnd && ltr)
+        || (state == SelectionStart && !ltr);
+    rightGap = (state == SelectionInside)
+        || (state == SelectionStart && ltr)
+        || (state == SelectionEnd && !ltr);
 }
 
 void LayoutBlockFlow::setPaginationStrut(LayoutUnit strut)