Remove UnusedParam.h

Source/core/css/MediaQueryEvaluator.cpp

Index: Source/core/css/MediaQueryEvaluator.cpp
diff --git a/Source/core/css/MediaQueryEvaluator.cpp b/Source/core/css/MediaQueryEvaluator.cpp
index 5fc54a82e6f3beb4ec7aef903b400f9356847e2f..47a9bae5cd308a4e661a4bc168cb48fc227ed602 100644
--- a/Source/core/css/MediaQueryEvaluator.cpp
+++ b/Source/core/css/MediaQueryEvaluator.cpp
@@ -579,9 +579,8 @@ static bool transform3dMediaFeatureEval(CSSValue* value, RenderStyle*, Frame* fr
     return returnValueIfNoParameter;
 }
 
-static bool viewModeMediaFeatureEval(CSSValue* value, RenderStyle*, Frame* frame, MediaFeaturePrefix op)
+static bool viewModeMediaFeatureEval(CSSValue* value, RenderStyle*, Frame* frame, MediaFeaturePrefix)
 {
-    UNUSED_PARAM(op);
     if (!value)
         return true;