Remove the concept of user stylesheets.

Source/core/css/DocumentRuleSets.cpp

Index: Source/core/css/DocumentRuleSets.cpp
diff --git a/Source/core/css/DocumentRuleSets.cpp b/Source/core/css/DocumentRuleSets.cpp
index dc17860b56f703a2b43e8b631bf480ba106da37e..fd3cfa0236d7b4f95587ea516db714c1c8ef2c76 100644
--- a/Source/core/css/DocumentRuleSets.cpp
+++ b/Source/core/css/DocumentRuleSets.cpp
@@ -47,32 +47,6 @@ DocumentRuleSets::~DocumentRuleSets()
 {
 }
 
-void DocumentRuleSets::initUserStyle(StyleEngine* styleSheetCollection, const Vector<RefPtr<StyleRule> >& watchedSelectors, const MediaQueryEvaluator& medium, StyleResolver& resolver)
-{
-    OwnPtr<RuleSet> tempUserStyle = RuleSet::create();
-    if (CSSStyleSheet* pageUserSheet = styleSheetCollection->pageUserSheet())
-        tempUserStyle->addRulesFromSheet(pageUserSheet->contents(), medium, &resolver);
-    collectRulesFromUserStyleSheets(styleSheetCollection->documentUserStyleSheets(), *tempUserStyle, medium, resolver);
-    collectRulesFromWatchedSelectors(watchedSelectors, *tempUserStyle);
-    if (tempUserStyle->ruleCount() > 0 || tempUserStyle->pageRules().size() > 0)
-        m_userStyle = tempUserStyle.release();
-}
-
-void DocumentRuleSets::collectRulesFromUserStyleSheets(const Vector<RefPtr<CSSStyleSheet> >& userSheets, RuleSet& userStyle, const MediaQueryEvaluator& medium, StyleResolver& resolver)
-{
-    for (unsigned i = 0; i < userSheets.size(); ++i) {
-        ASSERT(userSheets[i]->contents()->isUserStyleSheet());
-        userStyle.addRulesFromSheet(userSheets[i]->contents(), medium, &resolver);
-        resolver.addFontFaceRules(userStyle.fontFaceRules());
-    }
-}
-
-void DocumentRuleSets::collectRulesFromWatchedSelectors(const Vector<RefPtr<StyleRule> >& watchedSelectors, RuleSet& userStyle)
-{
-    for (unsigned i = 0; i < watchedSelectors.size(); ++i)
-        userStyle.addStyleRule(watchedSelectors[i].get(), RuleHasNoSpecialState);
-}
-
 void DocumentRuleSets::resetAuthorStyle()
 {
     m_treeBoundaryCrossingRules.clear();
@@ -89,9 +63,6 @@ void DocumentRuleSets::collectFeaturesTo(RuleFeatureSet& features, bool isViewSo
     if (isViewSource)
         features.add(CSSDefaultStyleSheets::viewSourceStyle()->features());
 
-    if (m_userStyle)
-        features.add(m_userStyle->features());
-
     m_treeBoundaryCrossingRules.collectFeaturesTo(features);
 }