CSSValue Immediates: Replace CSSValue usage with const references

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 348c7a09854c42c3501c04de589a8248fd2c2d48..adccab71e3ba223cfd04a244b2daeb01221938e9 100644
--- a/Source/core/css/resolver/FilterOperationResolver.cpp
+++ b/Source/core/css/resolver/FilterOperationResolver.cpp
@@ -71,7 +71,7 @@ static FilterOperation::OperationType filterOperationForType(CSSValueID type)
     }
 }
 
-bool FilterOperationResolver::createFilterOperations(CSSValue inValue, const CSSToLengthConversionData& conversionData, FilterOperations& outOperations, StyleResolverState& state)
+bool FilterOperationResolver::createFilterOperations(const CSSValue& inValue, const CSSToLengthConversionData& conversionData, FilterOperations& outOperations, StyleResolverState& state)
 {
     ASSERT(outOperations.isEmpty());
 
@@ -92,7 +92,7 @@ bool FilterOperationResolver::createFilterOperations(CSSValue inValue, const CSS
         if (operationType == FilterOperation::REFERENCE) {
             if (filterValue.length() != 1)
                 continue;
-            CSSValue argument = filterValue.item(0);
+            const CSSValue& argument = filterValue.item(0);
 
             if (!argument.isSVGDocumentValue())
                 continue;
@@ -173,7 +173,7 @@ bool FilterOperationResolver::createFilterOperations(CSSValue inValue, const CSS
             if (filterValue.length() != 1)
                 return false;
 
-            CSSValue cssValue = filterValue.item(0);
+            const CSSValue& cssValue = filterValue.item(0);
             if (!cssValue.isShadowValue())
                 continue;