Move nodeIsUserSelectAll() out from PositionAlgorithm template class

Source/core/editing/Position.cpp

Index: Source/core/editing/Position.cpp
diff --git a/Source/core/editing/Position.cpp b/Source/core/editing/Position.cpp
index 6716f960a70ab8033c29ccc9d94401ea67a8e9c0..04aadcfc5e1ff5fac0362d100ea8e551d9c09bc9 100644
--- a/Source/core/editing/Position.cpp
+++ b/Source/core/editing/Position.cpp
@@ -834,12 +834,6 @@ bool hasRenderedNonAnonymousDescendantsWithHeight(LayoutObject* layoutObject)
 }
 
 template <typename Strategy>
-bool PositionAlgorithm<Strategy>::nodeIsUserSelectAll(const Node* node)
-{
-    return RuntimeEnabledFeatures::userSelectAllEnabled() && node && node->layoutObject() && node->layoutObject()->style()->userSelect() == SELECT_ALL;
-}
-
-template <typename Strategy>
 Node* PositionAlgorithm<Strategy>::rootUserSelectAllForNode(Node* node)
 {
     if (!node || !nodeIsUserSelectAll(node))