Have StyleResolver / StyleResolverState deal with Document references, not pointers

Source/core/css/RuleSet.cpp

Index: Source/core/css/RuleSet.cpp
diff --git a/Source/core/css/RuleSet.cpp b/Source/core/css/RuleSet.cpp
index e6941096cfb64b7e23952bb22cc0b81178052d12..d7d56bfa00d70b4c35c69787d068665af8bee9db 100644
--- a/Source/core/css/RuleSet.cpp
+++ b/Source/core/css/RuleSet.cpp
@@ -415,7 +415,7 @@ void RuleSet::addRulesFromSheet(StyleSheetContents* sheet, const MediaQueryEvalu
             addRulesFromSheet(importRule->styleSheet(), medium, resolver, scope);
     }
 
-    bool hasDocumentSecurityOrigin = resolver && resolver->document()->securityOrigin()->canRequest(sheet->baseURL());
+    bool hasDocumentSecurityOrigin = resolver && resolver->document().securityOrigin()->canRequest(sheet->baseURL());
     AddRuleFlags addRuleFlags = static_cast<AddRuleFlags>((hasDocumentSecurityOrigin ? RuleHasDocumentSecurityOrigin : 0) | (!scope ? RuleCanUseFastCheckSelector : 0));
 
     addChildRules(sheet->childRules(), medium, resolver, scope, hasDocumentSecurityOrigin, addRuleFlags);