MQParser memory leak fix

Source/core/css/parser/MediaQueryParser.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/css/parser/MediaQueryParser.h"
 
 #include "MediaTypeNames.h"
 #include "core/css/parser/CSSPropertyParser.h"
 #include "core/css/parser/MediaQueryTokenizer.h"
@@ skipping 196 matching lines @@
     , m_mediaTypeSet(false)
 {
 }
 
 void MediaQueryData::clear()
 {
     m_restrictor = MediaQuery::None;
     m_mediaType = MediaTypeNames::all;
     m_mediaTypeSet = false;
     m_mediaFeature = String();
-    m_valueList.clear();
+    m_valueList.destroyAndClear();
     m_expressions = adoptPtrWillBeNoop(new ExpressionHeapVector);
 }
 
 PassOwnPtrWillBeRawPtr<MediaQuery> MediaQueryData::takeMediaQuery()
 {
     OwnPtrWillBeRawPtr<MediaQuery> mediaQuery = adoptPtrWillBeNoop(new MediaQuery(m_restrictor, m_mediaType, m_expressions.release()));
     clear();
     return mediaQuery.release();
 }
 
 bool MediaQueryData::addExpression()
 {
     OwnPtrWillBeRawPtr<MediaQueryExp> expression = MediaQueryExp::createIfValid(m_mediaFeature, &m_valueList);
     bool isValid = !!expression;
     m_expressions->append(expression.release());
-    m_valueList.clear();
+    m_valueList.destroyAndClear();
     return isValid;
 }
 
 void MediaQueryData::addParserValue(MediaQueryTokenType type, const MediaQueryToken& token)
 {
     CSSParserValue value;
     if (type == NumberToken || type == PercentageToken || type == DimensionToken) {
         value.setFromNumber(token.numericValue(), token.unitType());
         value.isInt = (token.numericValueType() == IntegerValueType);
     } else if (type == DelimiterToken) {
@@ skipping 10 matching lines @@
     m_valueList.addValue(value);
 }
 
 void MediaQueryData::setMediaType(const String& mediaType)
 {
     m_mediaType = mediaType;
     m_mediaTypeSet = true;
 }
 
 } // namespace WebCore