[bindings] Pass v8::Local<v8::Value> by value in NativeValueTraits<T>::nativeValue()

Source/bindings/tests/results/modules/UnionTypesModules.cpp

Index: Source/bindings/tests/results/modules/UnionTypesModules.cpp
diff --git a/Source/bindings/tests/results/modules/UnionTypesModules.cpp b/Source/bindings/tests/results/modules/UnionTypesModules.cpp
index 75ba666b57eb93700a0133cc800ea1bc90c16824..9ca446f6361cef9b45a4d884a095d85fe7b289e0 100644
--- a/Source/bindings/tests/results/modules/UnionTypesModules.cpp
+++ b/Source/bindings/tests/results/modules/UnionTypesModules.cpp
@@ -90,7 +90,7 @@ v8::Local<v8::Value> toV8(const BooleanOrString& impl, v8::Local<v8::Object> cre
     return v8::Local<v8::Value>();
 }
 
-BooleanOrString NativeValueTraits<BooleanOrString>::nativeValue(const v8::Local<v8::Value>& value, v8::Isolate* isolate, ExceptionState& exceptionState)
+BooleanOrString NativeValueTraits<BooleanOrString>::nativeValue(v8::Local<v8::Value> value, v8::Isolate* isolate, ExceptionState& exceptionState)
 {
     BooleanOrString impl;
     V8BooleanOrString::toImpl(isolate, value, impl, exceptionState);