Change StyleResolver::document() to be private

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 e6eb2f31e3dbf4d9063f2e89c8b6c1a5cd3b876d..33e6717f4a3fd9e424274c26e0457b5e5853d71e 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -193,7 +193,19 @@ void StyleResolver::appendCSSStyleSheet(CSSStyleSheet* cssSheet)
 
     ScopedStyleResolver& resolver = treeScope->ensureScopedStyleResolver();
     document().styleEngine()->addScopedStyleResolver(&resolver);
-    resolver.addRulesFromSheet(cssSheet, *m_medium, this);
+    unsigned index = resolver.appendCSSStyleSheet(cssSheet);
+
+    addRulesFromSheet(cssSheet, treeScope, index);
+}
+
+void StyleResolver::addRulesFromSheet(CSSStyleSheet* cssSheet, TreeScope* treeScope, unsigned index)
+{
+    StyleSheetContents* sheet = cssSheet->contents();
+    AddRuleFlags addRuleFlags = document().securityOrigin()->canRequest(sheet->baseURL()) ? RuleHasDocumentSecurityOrigin : RuleHasNoSpecialState;
+    const RuleSet& ruleSet = sheet->ensureRuleSet(*m_medium, addRuleFlags);
+
+    addMediaQueryResults(ruleSet.viewportDependentMediaQueryResults());
+    processScopedRules(ruleSet, cssSheet, index, treeScope->rootNode());
 }
 
 void StyleResolver::appendPendingAuthorStyleSheets()