Update error message in java_cpp_enum.py.

build/android/gyp/java_cpp_enum_tests.py

 #!/usr/bin/env python
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Tests for enum_preprocess.py.
 
 This test suite containss various tests for the C++ -> Java enum generator.
 """
 
@@ skipping 391 matching lines @@
   def testParseMalformedMultiLineDirectiveShort(self):
     test_data = """
       // GENERATED_JAVA_ENUM_PACKAGE: (
       enum Foo {
         FOO_A,
       };
     """.split('\n')
     with self.assertRaises(Exception):
       HeaderParser(test_data).ParseDefinitions()
 
+  def testParseMalformedMultiLineDirectiveMissingBrackets(self):
+    test_data = """
+      // GENERATED_JAVA_ENUM_PACKAGE:
+      // test.namespace
+      enum Foo {
+        FOO_A,
+      };
+    """.split('\n')
+    with self.assertRaises(Exception):
+      HeaderParser(test_data).ParseDefinitions()
+
   def testEnumValueAssignmentNoneDefined(self):
     definition = EnumDefinition(original_enum_name='c', enum_package='p')
     definition.AppendEntry('A', None)
     definition.AppendEntry('B', None)
     definition.AppendEntry('C', None)
     definition.Finalize()
     self.assertEqual(collections.OrderedDict([('A', 0),
                                               ('B', 1),
                                               ('C', 2)]),
                      definition.entries)
@@ skipping 107 matching lines @@
   options, _ = parser.parse_args(argv)
 
   suite = unittest.TestLoader().loadTestsFromTestCase(TestPreprocess)
   unittest.TextTestRunner(verbosity=0).run(suite)
 
   if options.stamp:
     build_utils.Touch(options.stamp)
 
 if __name__ == '__main__':
   main(sys.argv[1:])