Move a static member function nodeIsUserSelectNone() out from PositionAlgorithm template class

Source/core/html/HTMLLabelElement.cpp

Index: Source/core/html/HTMLLabelElement.cpp
diff --git a/Source/core/html/HTMLLabelElement.cpp b/Source/core/html/HTMLLabelElement.cpp
index 4451cc59d8191964a702562e3178122d3db6ff28..72b328be2c5e1dc8f3b84d6f397164caea89d26b 100644
--- a/Source/core/html/HTMLLabelElement.cpp
+++ b/Source/core/html/HTMLLabelElement.cpp
@@ -28,6 +28,7 @@
 #include "core/HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/ElementTraversal.h"
+#include "core/editing/EditingUtilities.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/SelectionController.h"
 #include "core/events/MouseEvent.h"
@@ -161,7 +162,7 @@ void HTMLLabelElement::defaultEventHandler(Event* evt)
             if (LocalFrame* frame = document().frame()) {
                 // Check if there is a selection and click is not on the
                 // selection.
-                if (!Position::nodeIsUserSelectNone(this) && frame->selection().isRange() && !frame->eventHandler().selectionController().mouseDownWasSingleClickInSelection())
+                if (!nodeIsUserSelectNone(this) && frame->selection().isRange() && !frame->eventHandler().selectionController().mouseDownWasSingleClickInSelection())
                     isLabelTextSelected = true;
                 // If selection is there and is single click i.e. text is
                 // selected by dragging over label text, then return.