Move nodeIsUserSelectAll() out from PositionAlgorithm template class

Source/core/editing/EditingUtilities.cpp

Index: Source/core/editing/EditingUtilities.cpp
diff --git a/Source/core/editing/EditingUtilities.cpp b/Source/core/editing/EditingUtilities.cpp
index db0b79b17f54729739a2989815769f00bd33416f..def314aad321dec0e32f2de4d117e4297d9b8d51 100644
--- a/Source/core/editing/EditingUtilities.cpp
+++ b/Source/core/editing/EditingUtilities.cpp
@@ -545,6 +545,12 @@ bool inSameContainingBlockFlowElement(Node* a, Node* b)
     return a && b && enclosingBlockFlowElement(*a) == enclosingBlockFlowElement(*b);
 }
 
+bool nodeIsUserSelectAll(const Node* node)
+{
+    return RuntimeEnabledFeatures::userSelectAllEnabled() && node && node->layoutObject() && node->layoutObject()->style()->userSelect() == SELECT_ALL;
+
+}
+
 bool nodeIsUserSelectNone(Node* node)
 {
     return node && node->layoutObject() && !node->layoutObject()->isSelectable();