Remove the concept of user stylesheets.

Source/core/page/Settings.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2011, 2012 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 338 matching lines @@
 
     // See comment in setLoadsImagesAutomatically.
     m_setImageLoadingSettingsTimer.startOneShot(0);
 }
 
 void Settings::setPluginsEnabled(bool arePluginsEnabled)
 {
     m_arePluginsEnabled = arePluginsEnabled;
 }
 
-void Settings::setUserStyleSheetLocation(const KURL& userStyleSheetLocation)
-{
-    if (m_userStyleSheetLocation == userStyleSheetLocation)
-        return;
-
-    m_userStyleSheetLocation = userStyleSheetLocation;
-
-    m_page->userStyleSheetLocationChanged();
-}
-
 void Settings::setDNSPrefetchingEnabled(bool dnsPrefetchingEnabled)
 {
     if (m_dnsPrefetchingEnabled == dnsPrefetchingEnabled)
         return;
 
     m_dnsPrefetchingEnabled = dnsPrefetchingEnabled;
     m_page->dnsPrefetchingStateChanged();
 }
 
 void Settings::setMockScrollbarsEnabled(bool flag)
@@ skipping 32 matching lines @@
     if (m_page->mainFrame())
         m_page->mainFrame()->document()->updateViewportDescription();
 }
 
 void Settings::setViewportMetaEnabled(bool enabled)
 {
     m_viewportMetaEnabled = enabled;
 }
 
 } // namespace WebCore