| Index: Source/core/css/MediaQueryExp.cpp
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| diff --git a/Source/core/css/MediaQueryExp.cpp b/Source/core/css/MediaQueryExp.cpp
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| index 1b8a8048e256bb05a2de1930c7577392a3fb6e0c..a7260d16cf7904170b34a02196238efa8c0803ba 100644
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| --- a/Source/core/css/MediaQueryExp.cpp
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| +++ b/Source/core/css/MediaQueryExp.cpp
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| @@ -215,6 +215,8 @@ PassOwnPtrWillBeRawPtr<MediaQueryExp> MediaQueryExp::createIfValid(const String&
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|  {
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|      ASSERT(!mediaFeature.isNull());
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|  
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| +    // FIXME - Creation of CSSValue here may not be thread safe.
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| +    // It should be replaced by a different way to pass the values to MediaQueryEvaluator.
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|      RefPtrWillBeRawPtr<CSSValue> cssValue = nullptr;
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|      bool isValid = false;
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|      String lowerMediaFeature = attemptStaticStringCreation(mediaFeature.lower());
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| 
 |