Fix test for unexpected type url when parsing Any. Currently, the test fails…

Fix test for unexpected type url when parsing Any. Currently, the test fails since TestAllTypes doesn't have field '@type', which is the same test as testUnknownFields.

java/util/src/test/java/com/google/protobuf/util/JsonFormatTest.java

@@ -1099,7 +1099,7 @@ public class JsonFormatTest extends TestCase {
 
   public void testParserUnexpectedTypeUrl() throws Exception {
     try {
-      TestAllTypes.Builder builder = TestAllTypes.newBuilder();
+      Any.Builder builder = Any.newBuilder();
       mergeFromJson(
           "{\n"
               + "  \"@type\": \"type.googleapis.com/json_test.TestAllTypes\",\n"