Remove the concept of user stylesheets.

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index 111d1e5a783c6b9ada4b8ff012e4c6d77c18b74e..54b13afea2f310a74a438ce827eabc1e43d06423 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -175,7 +175,6 @@ StyleResolver::StyleResolver(Document& document, bool matchAuthorAndUserStyles)
     m_styleTree.clear();
 
     StyleEngine* styleSheetCollection = document.styleEngine();
-    m_ruleSets.initUserStyle(styleSheetCollection, CSSSelectorWatch::from(document).watchedCallbackSelectors(), *m_medium, *this);
 
 #if ENABLE(SVG_FONTS)
     if (document.svgExtensions()) {
@@ -480,22 +479,6 @@ void StyleResolver::matchAuthorRules(Element* element, ElementRuleCollector& col
     matchHostRules(element, resolvers.first(), collector, includeEmptyRules);
 }
 
-void StyleResolver::matchUserRules(ElementRuleCollector& collector, bool includeEmptyRules)
-{
-    if (!m_ruleSets.userStyle())
-        return;
-
-    collector.clearMatchedRules();
-    collector.matchedResult().ranges.lastUserRule = collector.matchedResult().matchedProperties.size() - 1;
-
-    MatchRequest matchRequest(m_ruleSets.userStyle(), includeEmptyRules);
-    RuleRange ruleRange = collector.matchedResult().ranges.userRuleRange();
-    collector.collectMatchingRules(matchRequest, ruleRange);
-    collector.collectMatchingRulesForRegion(matchRequest, ruleRange);
-
-    collector.sortAndTransferMatchedRules();
-}
-
 void StyleResolver::matchUARules(ElementRuleCollector& collector)
 {
     collector.setMatchingUARules(true);
@@ -534,10 +517,6 @@ void StyleResolver::matchAllRules(StyleResolverState& state, ElementRuleCollecto
 {
     matchUARules(collector);
 
-    // Now we check user sheet rules.
-    if (matchAuthorAndUserStyles)
-        matchUserRules(collector, false);
-
     // Now check author rules, beginning first with presentational attributes mapped from HTML.
     if (state.element()->isStyledElement()) {
         collector.addElementStyleProperties(state.element()->presentationAttributeStyle());
@@ -1043,10 +1022,8 @@ PassRefPtr<RenderStyle> StyleResolver::pseudoStyleForElement(Element* e, const P
         collector.setPseudoStyleRequest(pseudoStyleRequest);
 
         matchUARules(collector);
-        if (m_matchAuthorAndUserStyles) {
-            matchUserRules(collector, false);
+        if (m_matchAuthorAndUserStyles)
             matchAuthorRules(state.element(), collector, false);
-        }
 
         if (collector.matchedResult().matchedProperties.isEmpty())
             return 0;
@@ -1088,7 +1065,6 @@ PassRefPtr<RenderStyle> StyleResolver::styleForPage(int pageIndex)
     PageRuleCollector collector(rootElementStyle, pageIndex);
 
     collector.matchPageRules(CSSDefaultStyleSheets::defaultPrintStyle);
-    collector.matchPageRules(m_ruleSets.userStyle());
 
     if (ScopedStyleResolver* scopedResolver = m_styleTree.scopedStyleResolverForDocument())
         scopedResolver->matchPageRules(collector);
@@ -1127,9 +1103,6 @@ void StyleResolver::collectViewportRules()
     if (document().isMobileDocument())
         viewportStyleResolver()->collectViewportRules(CSSDefaultStyleSheets::xhtmlMobileProfileStyle(), ViewportStyleResolver::UserAgentOrigin);
 
-    if (m_ruleSets.userStyle())
-        viewportStyleResolver()->collectViewportRules(m_ruleSets.userStyle(), ViewportStyleResolver::UserAgentOrigin);
-
     if (ScopedStyleResolver* scopedResolver = m_styleTree.scopedStyleResolverForDocument())
         scopedResolver->collectViewportRulesTo(this);
 
@@ -1163,20 +1136,10 @@ bool StyleResolver::checkRegionStyle(Element* regionElement)
 {
     // FIXME (BUG 72472): We don't add @-webkit-region rules of scoped style sheets for the moment,
     // so all region rules are global by default. Verify whether that can stand or needs changing.
-
-    if (ScopedStyleResolver* scopedResolver = m_styleTree.scopedStyleResolverForDocument())
+    if (ScopedStyleResolver* scopedResolver = m_styleTree.scopedStyleResolverForDocument()) {
         if (scopedResolver->checkRegionStyle(regionElement))
             return true;
-
-    if (m_ruleSets.userStyle()) {
-        unsigned rulesSize = m_ruleSets.userStyle()->m_regionSelectorsAndRuleSets.size();
-        for (unsigned i = 0; i < rulesSize; ++i) {
-            ASSERT(m_ruleSets.userStyle()->m_regionSelectorsAndRuleSets.at(i).ruleSet.get());
-            if (checkRegionSelector(m_ruleSets.userStyle()->m_regionSelectorsAndRuleSets.at(i).selector, regionElement))
-                return true;
-        }
     }
-
     return false;
 }
 
@@ -1217,10 +1180,6 @@ void StyleResolver::collectPseudoRulesForElement(Element* element, ElementRuleCo
     if (rulesToInclude & UAAndUserCSSRules) {
         // First we match rules from the user agent sheet.
         matchUARules(collector);
-
-        // Now we check user sheet rules.
-        if (m_matchAuthorAndUserStyles)
-            matchUserRules(collector, rulesToInclude & EmptyCSSRules);
     }
 
     if (m_matchAuthorAndUserStyles && (rulesToInclude & AuthorCSSRules)) {