Use begin/end istead of first/last for rule ranges.

Source/core/css/ElementRuleCollector.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, 2013 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 253 matching lines @@
         return;
     }
 
     // Now transfer the set of matched rules over to our list of declarations.
     for (unsigned i = 0; i < m_matchedRules.size(); i++) {
         const RuleData* ruleData = m_matchedRules[i].ruleData();
         m_result.addMatchedProperties(&ruleData->rule()->properties(), ruleData->linkMatchType(), ruleData->propertyWhitelistType(m_matchingUARules));
     }
 
     if (m_matchingUARules)
-        m_result.lastUARuleIndex = m_result.matchedProperties.size() - 1;
+        m_result.uaEnd = m_result.matchedProperties.size();
 }
 
 void ElementRuleCollector::didMatchRule(const RuleData& ruleData, const SelectorChecker::MatchResult& result, CascadeOrder cascadeOrder, const MatchRequest& matchRequest)
 {
     PseudoId dynamicPseudo = result.dynamicPseudo;
     // If we're matching normal rules, set a pseudo bit if
     // we really just matched a pseudo-element.
     if (dynamicPseudo != NOPSEUDO && m_pseudoStyleRequest.pseudoId == NOPSEUDO) {
         if (m_mode == SelectorChecker::CollectingCSSRules || m_mode == SelectorChecker::CollectingStyleRules)
             return;
@@ skipping 35 matching lines @@
     // should not see the element's treescope. Because RuleSet has no
     // information about "scope".
     MatchRequest matchRequest(ruleSet);
     collectMatchingRules(matchRequest);
     collectMatchingShadowHostRules(matchRequest);
 
     return !m_matchedRules.isEmpty();
 }
 
 } // namespace blink