Remove the concept of user stylesheets.

Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 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.
@@ skipping 1860 matching lines @@
 void Internals::evictAllResources() const
 {
     memoryCache()->evictResources();
 }
 
 void Internals::allowRoundingHacks() const
 {
     TextRun::setAllowsRoundingHacks(true);
 }
 
-void Internals::insertAuthorCSS(Document* document, const String& css) const
-{
-    if (!document)
-        return;
-
-    RefPtr<StyleSheetContents> parsedSheet = StyleSheetContents::create(*document);
-    parsedSheet->setIsUserStyleSheet(false);
-    parsedSheet->parseString(css);
-    document->styleEngine()->addAuthorSheet(parsedSheet);
-}
-
-void Internals::insertUserCSS(Document* document, const String& css) const
-{
-    if (!document)
-        return;
-
-    RefPtr<StyleSheetContents> parsedSheet = StyleSheetContents::create(*document);
-    parsedSheet->setIsUserStyleSheet(true);
-    parsedSheet->parseString(css);
-    document->styleEngine()->addUserSheet(parsedSheet);
-}
-
 String Internals::counterValue(Element* element)
 {
     if (!element)
         return String();
 
     return counterValueForElement(element);
 }
 
 int Internals::pageNumber(Element* element, float pageWidth, float pageHeight)
 {
@@ skipping 357 matching lines @@
     }
 
     document->updateLayout();
 
     RenderView* view = document->renderView();
     if (view->compositor())
         view->compositor()->updateCompositingLayers(CompositingUpdateFinishAllDeferredWork);
 }
 
 }