fix test harness for native optimizer

tests/test_other.py

@@ -1945,7 +1945,7 @@ int f() {
         shutil.copyfile(input, input_temp)
         Popen(listify(NODE_JS) + [path_from_root('tools', 'js-optimizer.js'), input_temp, 'emitJSON'], stdin=PIPE, stdout=open(input_temp + '.js', 'w')).communicate()
         output = Popen([js_optimizer.get_native_optimizer(), input_temp + '.js'] + passes, stdin=PIPE, stdout=open(output_temp, 'w')).communicate()[0]
-        Popen(listify(NODE_JS) + [path_from_root('tools', 'js-optimizer.js'), output_temp, 'emitJSON'], stdin=PIPE, stdout=open(output_temp + '.js', 'w')).communicate()
+        Popen(listify(NODE_JS) + [path_from_root('tools', 'js-optimizer.js'), output_temp, 'receiveJSON'], stdin=PIPE, stdout=open(output_temp + '.js', 'w')).communicate()
         output = open(output_temp + '.js').read()
         self.assertIdentical(expected, output.replace('\r\n', '\n').replace('\n\n', '\n'))