Have StyleResolver / StyleResolverState deal with Document references, not pointers

Source/core/inspector/InspectorCSSAgent.cpp

Index: Source/core/inspector/InspectorCSSAgent.cpp
diff --git a/Source/core/inspector/InspectorCSSAgent.cpp b/Source/core/inspector/InspectorCSSAgent.cpp
index 775e9972899a70da1e17a25ee34ac411d4b71127..e68063395af08284bc6c44eeddf99d0b5e1a8f0d 100644
--- a/Source/core/inspector/InspectorCSSAgent.cpp
+++ b/Source/core/inspector/InspectorCSSAgent.cpp
@@ -1587,7 +1587,7 @@ PassRefPtr<TypeBuilder::CSS::CSSRule> InspectorCSSAgent::buildObjectForRule(CSSS
     // Since the inspector wants to walk the parent chain, we construct the full wrappers here.
     // FIXME: This could be factored better. StyleResolver::styleRulesForElement should return a StyleRule vector, not a CSSRuleList.
     if (!rule->parentStyleSheet()) {
-        rule = styleResolver->inspectorCSSOMWrappers().getWrapperForRuleInSheets(rule->styleRule(), styleResolver->document()->styleSheetCollections());
+        rule = styleResolver->inspectorCSSOMWrappers().getWrapperForRuleInSheets(rule->styleRule(), styleResolver->document().styleSheetCollections());
         if (!rule)
             return 0;
     }