Avoid nearly identical toImplArray() and toImplHeapArray()

Source/bindings/tests/results/core/UnionTypesCore.cpp

Index: Source/bindings/tests/results/core/UnionTypesCore.cpp
diff --git a/Source/bindings/tests/results/core/UnionTypesCore.cpp b/Source/bindings/tests/results/core/UnionTypesCore.cpp
index 3fd6ee5ceb00083b08a6ab830325e6614aa2bed9..942998d21a3e11a794cc8f31e8063b2fd0ec7f89 100644
--- a/Source/bindings/tests/results/core/UnionTypesCore.cpp
+++ b/Source/bindings/tests/results/core/UnionTypesCore.cpp
@@ -857,7 +857,7 @@ void V8StringOrStringSequence::toImpl(v8::Isolate* isolate, v8::Local<v8::Value>
         return;
 
     if (v8Value->IsArray()) {
-        Vector<String> cppValue = toImplArray<String>(v8Value, 0, isolate, exceptionState);
+        Vector<String> cppValue = toImplArray<Vector<String>>(v8Value, 0, isolate, exceptionState);
         if (exceptionState.hadException())
             return;
         impl.setStringSequence(cppValue);