Update union conversion algorithm

third_party/WebKit/Source/core/testing/UnionTypesTest.idl

Index: third_party/WebKit/Source/core/testing/UnionTypesTest.idl
diff --git a/third_party/WebKit/Source/core/testing/UnionTypesTest.idl b/third_party/WebKit/Source/core/testing/UnionTypesTest.idl
index 013ad580a16d9d0d5657154f11d482fec8244465..88578720b09d8c0218ffbeb537b14c917855d03c 100644
--- a/third_party/WebKit/Source/core/testing/UnionTypesTest.idl
+++ b/third_party/WebKit/Source/core/testing/UnionTypesTest.idl
@@ -2,8 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-[
-] interface UnionTypesTest {
+interface UnionTypesTest {
     attribute (double or DOMString or DOMString[]) doubleOrStringOrStringArrayAttribute;
 
     DOMString doubleOrStringArg((double or DOMString) arg);
@@ -23,4 +22,6 @@
     DOMString doubleOrStringOrStringSequenceArg((double or DOMString or sequence<DOMString>) arg);
     [ImplementedAs=doubleOrStringOrStringArrayArg] DOMString doubleOrStringOrStringArrayNullableArg((double or DOMString or DOMString[])? arg);
     [ImplementedAs=doubleOrStringOrStringSequenceArg] DOMString doubleOrStringOrStringSequenceNullableArg((double or DOMString or sequence<DOMString>)? arg);
+
+    DOMString internalDictionaryOrStringSequenceArg((InternalDictionary or sequence<DOMString>) arg);
 };