Remove UnusedParam.h

Source/core/css/resolver/FilterOperationResolver.cpp

Index: Source/core/css/resolver/FilterOperationResolver.cpp
diff --git a/Source/core/css/resolver/FilterOperationResolver.cpp b/Source/core/css/resolver/FilterOperationResolver.cpp
index 2cfa2142b85299a62ff5d7e72209d65dddec9aa8..779372ba9751dae93bffea3a2500b25419c06910 100644
--- a/Source/core/css/resolver/FilterOperationResolver.cpp
+++ b/Source/core/css/resolver/FilterOperationResolver.cpp
@@ -205,10 +205,9 @@ static bool parseCustomFilterParameterList(CSSValue* parametersValue, CustomFilt
     return true;
 }
 
-static PassRefPtr<CustomFilterOperation> createCustomFilterOperationWithAtRuleReferenceSyntax(CSSFilterValue* filterValue)
+static PassRefPtr<CustomFilterOperation> createCustomFilterOperationWithAtRuleReferenceSyntax(CSSFilterValue*)
 {
     // FIXME: Implement style resolution for the custom filter at-rule reference syntax.
-    UNUSED_PARAM(filterValue);
     return 0;
 }