Remove the concept of user stylesheets.

Source/web/WebSettingsImpl.cpp

 /*
  * Copyright (C) 2009 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 272 matching lines @@
 void WebSettingsImpl::setJavaEnabled(bool enabled)
 {
     m_settings->setJavaEnabled(enabled);
 }
 
 void WebSettingsImpl::setAllowScriptsToCloseWindows(bool allow)
 {
     m_settings->setAllowScriptsToCloseWindows(allow);
 }
 
-void WebSettingsImpl::setUserStyleSheetLocation(const WebURL& location)
-{
-    m_settings->setUserStyleSheetLocation(location);
-}
-
 void WebSettingsImpl::setUseLegacyBackgroundSizeShorthandBehavior(bool useLegacyBackgroundSizeShorthandBehavior)
 {
     m_settings->setUseLegacyBackgroundSizeShorthandBehavior(useLegacyBackgroundSizeShorthandBehavior);
 }
 
 void WebSettingsImpl::setWideViewportQuirkEnabled(bool wideViewportQuirkEnabled)
 {
     m_settings->setWideViewportQuirkEnabled(wideViewportQuirkEnabled);
 }
 
@@ skipping 463 matching lines @@
 {
     m_settings->setUseSolidColorScrollbars(enabled);
 }
 
 void WebSettingsImpl::setMainFrameResizesAreOrientationChanges(bool enabled)
 {
     m_mainFrameResizesAreOrientationChanges = enabled;
 }
 
 } // namespace blink