(Concept patch) Simplify WTF::HashTable::add() return value for size and performance

Source/core/css/RuleSet.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 372 matching lines @@
 {
     for (size_t selectorIndex = 0; selectorIndex != kNotFound; selectorIndex = rule->selectorList().indexOfNextSelectorAfter(selectorIndex))
         addRule(rule, selectorIndex, addRuleFlags);
 }
 
 void RuleSet::compactPendingRules(PendingRuleMap& pendingMap, CompactRuleMap& compactMap)
 {
     PendingRuleMap::iterator end = pendingMap.end();
     for (PendingRuleMap::iterator it = pendingMap.begin(); it != end; ++it) {
         OwnPtr<LinkedStack<RuleData> > pendingRules = it->value.release();
-        CompactRuleMap::iterator compactRules = compactMap.add(it->key, nullptr).iterator;
+        CompactRuleMap::ValueType* compactRules = compactMap.add(it->key, nullptr).iterator;
 
         TerminatedArrayBuilder<RuleData> builder(compactRules->value.release());
         builder.grow(pendingRules->size());
         while (!pendingRules->isEmpty()) {
             builder.append(pendingRules->peek());
             pendingRules->pop();
         }
 
         compactRules->value = builder.release();
     }
@@ skipping 13 matching lines @@
     m_universalRules.shrinkToFit();
     m_pageRules.shrinkToFit();
     m_viewportRules.shrinkToFit();
     m_fontFaceRules.shrinkToFit();
     m_keyframesRules.shrinkToFit();
     m_treeBoundaryCrossingRules.shrinkToFit();
     m_shadowDistributedRules.shrinkToFit();
 }
 
 } // namespace WebCore