Labels with user-select: none should pass events to control element

Source/core/html/HTMLLabelElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 142 matching lines @@
 
         // If the click is not simulated and the text of the label element
         // is selected by dragging over it, then return without passing the
         // click event to control element.
         // Note: a click event may be not a mouse event if created by
         // document.createEvent().
         if (evt->isMouseEvent() && !toMouseEvent(evt)->isSimulated()) {
             if (LocalFrame* frame = document().frame()) {
                 // Check if there is a selection and click is not on the
                 // selection.
-                if (frame->selection().isRange() && !frame->eventHandler().mouseDownWasSingleClickInSelection())
+                if (!Position::nodeIsUserSelectNone(this) && frame->selection().isRange() && !frame->eventHandler().mouseDownWasSingleClickInSelection())
                     isLabelTextSelected = true;
                 // If selection is there and is single click i.e. text is
                 // selected by dragging over label text, then return.
                 // Click count >=2, meaning double click or triple click,
                 // should pass click event to control element.
                 // Only in case of drag, *neither* we pass the click event,
                 // *nor* we focus the control element.
                 if (isLabelTextSelected && frame->eventHandler().clickCount() == 1)
                     return;
             }
@@ skipping 102 matching lines @@
 
 void HTMLLabelElement::parseAttribute(const QualifiedName& attributeName, const AtomicString& attributeValue)
 {
     if (attributeName == formAttr)
         formAttributeChanged();
     else
         HTMLElement::parseAttribute(attributeName, attributeValue);
 }
 
 } // namespace