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

Source/core/css/resolver/MatchResult.h

Index: Source/core/css/resolver/MatchResult.h
diff --git a/Source/core/css/resolver/MatchResult.h b/Source/core/css/resolver/MatchResult.h
index 342f4fb1a3eaffb335c6c34967d8f49d55f30029..eee39dbff2d505e386f6f0dafcc81b1f317604d5 100644
--- a/Source/core/css/resolver/MatchResult.h
+++ b/Source/core/css/resolver/MatchResult.h
@@ -87,8 +87,6 @@ private:
 class CORE_EXPORT MatchResult {
     STACK_ALLOCATED();
 public:
-    MatchResult();
-
     void addMatchedProperties(const StylePropertySet* properties, unsigned linkMatchType = CSSSelector::MatchAll, PropertyWhitelistType = PropertyWhitelistNone);
     bool hasMatchedProperties() const { return m_matchedProperties.size(); }