Simpler return value of HashTable::add/HashMap:add and others

Source/core/css/resolver/ScopedStyleTree.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 40 matching lines @@
         && !scopingNode.isShadowRoot())
         return 0;
     return lookupScopedStyleResolverFor(&scopingNode);
 }
 
 ScopedStyleResolver* ScopedStyleTree::addScopedStyleResolver(ContainerNode& scopingNode, bool& isNewEntry)
 {
     HashMap<const ContainerNode*, OwnPtr<ScopedStyleResolver> >::AddResult addResult = m_authorStyles.add(&scopingNode, nullptr);
 
     if (addResult.isNewEntry) {
-        addResult.iterator->value = ScopedStyleResolver::create(scopingNode);
+        addResult.storedValue->value = ScopedStyleResolver::create(scopingNode);
         if (scopingNode.isDocumentNode())
-            m_scopedResolverForDocument = addResult.iterator->value.get();
+            m_scopedResolverForDocument = addResult.storedValue->value.get();
     }
     isNewEntry = addResult.isNewEntry;
-    return addResult.iterator->value.get();
+    return addResult.storedValue->value.get();
 }
 
 void ScopedStyleTree::setupScopedStylesTree(ScopedStyleResolver* target)
 {
     ASSERT(target);
 
     const ContainerNode& scopingNode = target->scopingNode();
 
     // Since StyleResolver creates RuleSets according to styles' document
     // order, a parent of the given ScopedRuleData has been already
@@ skipping 137 matching lines @@
         return;
 
     reparentNodes(resolverRemoved, resolverRemoved->parent());
     if (m_cache.scopedResolver == resolverRemoved)
         m_cache.clear();
 
     m_authorStyles.remove(scopingNode);
 }
 
 } // namespace WebCore