Remove work-around for Win-Clang in-class initializer bug

Source/core/css/resolver/MatchResult.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 30 matching lines @@
 
 MatchedProperties::~MatchedProperties()
 {
 }
 
 DEFINE_TRACE(MatchedProperties)
 {
     visitor->trace(properties);
 }
 
-// TODO(thakis): Remove this once http://crbug.com/488634 is fixed.
-MatchResult::MatchResult() = default;
-
 void MatchResult::addMatchedProperties(const StylePropertySet* properties, unsigned linkMatchType, PropertyWhitelistType propertyWhitelistType)
 {
     m_matchedProperties.grow(m_matchedProperties.size() + 1);
     MatchedProperties& newProperties = m_matchedProperties.last();
     newProperties.properties = const_cast<StylePropertySet*>(properties);
     newProperties.m_types.linkMatchType = linkMatchType;
     newProperties.m_types.whitelistType = propertyWhitelistType;
 }
 
 void MatchResult::finishAddingUARules()
 {
     m_uaRangeEnd = m_matchedProperties.size();
 }
 
 void MatchResult::finishAddingAuthorRulesForTreeScope()
 {
     // Don't add empty ranges.
     if (m_authorRangeEnds.isEmpty() && m_uaRangeEnd == m_matchedProperties.size())
         return;
     if (!m_authorRangeEnds.isEmpty() && m_authorRangeEnds.last() == m_matchedProperties.size())
         return;
     m_authorRangeEnds.append(m_matchedProperties.size());
 }
 
 } // namespace blink