WTF::notFound looks too much like a local variable.

Source/core/accessibility/AccessibilityScrollView.cpp

Index: Source/core/accessibility/AccessibilityScrollView.cpp
diff --git a/Source/core/accessibility/AccessibilityScrollView.cpp b/Source/core/accessibility/AccessibilityScrollView.cpp
index cc35e737c7a044fe1d3189dfcf70bf7f6a2d3bf0..3e13f5bae7152fad8117e4ecfcc0bb06246f4bd9 100644
--- a/Source/core/accessibility/AccessibilityScrollView.cpp
+++ b/Source/core/accessibility/AccessibilityScrollView.cpp
@@ -117,7 +117,7 @@ void AccessibilityScrollView::updateScrollbars()
 void AccessibilityScrollView::removeChildScrollbar(AccessibilityObject* scrollbar)
 {
     size_t pos = m_children.find(scrollbar);
-    if (pos != WTF::notFound) {
+    if (pos != kNotFound) {
         m_children[pos]->detachFromParent();
         m_children.remove(pos);
     }