Use isSpaceOrNewline rather than its implementation

Source/web/PopupListBox.cpp

 /*
  * Copyright (c) 2011, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 270 matching lines @@
     return m_popupClient->menuStyle().textDirection() == RTL;
 }
 
 // From HTMLSelectElement.cpp
 static String stripLeadingWhiteSpace(const String& string)
 {
     int length = string.length();
     int i;
     for (i = 0; i < length; ++i)
         if (string[i] != noBreakSpace
-            && (string[i] <= 0x7F ? !isASCIISpace(string[i]) : (direction(string[i]) != WhiteSpaceNeutral)))
+            && !isSpaceOrNewline(string[i]))
             break;
 
     return string.substring(i, length - i);
 }
 
 // From HTMLSelectElement.cpp, with modifications
 void PopupListBox::typeAheadFind(const PlatformKeyboardEvent& event)
 {
     TimeStamp now = static_cast<TimeStamp>(currentTime() * 1000.0f);
     TimeStamp delta = now - m_lastCharTime;
@@ skipping 515 matching lines @@
 {
     return numItems() && IntRect(0, 0, width(), height()).contains(point);
 }
 
 int PopupListBox::popupContentHeight() const
 {
     return height();
 }
 
 } // namespace WebCore