Update error message in java_cpp_enum.py.

build/android/gyp/java_cpp_enum_tests.py

Index: build/android/gyp/java_cpp_enum_tests.py
diff --git a/build/android/gyp/java_cpp_enum_tests.py b/build/android/gyp/java_cpp_enum_tests.py
index b3cef7cdad9658f7a21adb13556784fe2f6df39d..88b2b6009b5751ff92b6b8b0ab5141db9eb2f69f 100755
--- a/build/android/gyp/java_cpp_enum_tests.py
+++ b/build/android/gyp/java_cpp_enum_tests.py
@@ -409,6 +409,17 @@ public class ClassName {
     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)