Fix some minor bugs related to imports in the new mojom bindings generator.

mojo/public/tools/bindings/pylib/mojom/generate/mojom_translator_unittest.py

 # Copyright 2015 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.
 
 import unittest
 import module
 
 try:
   import mojom_translator
   from generated import mojom_files_mojom
@@ skipping 338 matching lines @@
 
     # Translate should create the imports.
     translator = mojom_translator.FileTranslator(graph, 'a.mojom')
     translator.Translate()
 
     struct = translator.UserDefinedFromTypeRef(
         mojom_types_mojom.Type(
           type_reference=mojom_types_mojom.TypeReference(
             type_key=type_key)))
 
-    self.assertIsNone(struct.module)
+    self.assertEquals(
+        translator._imports['root/c.mojom']['module'], struct.module)
     self.assertEquals(translator._imports['root/c.mojom'], struct.imported_from)
 
   def test_interface(self):
     file_name = 'a.mojom'
     mojom_interface = mojom_types_mojom.MojomInterface(
         decl_data=mojom_types_mojom.DeclarationData(
           source_file_info=mojom_types_mojom.SourceFileInfo(
             file_name=file_name)),
         interface_name='AnInterface')
     mojom_method = mojom_types_mojom.MojomMethod(
@@ skipping 316 matching lines @@
     result2 = t.KindFromMojom(mojom_type)
     self.assertIs(result, result2)
 
     # Nullable type reference
     mojom_type.type_reference.nullable = True
     nullable_result = t.KindFromMojom(mojom_type)
     self.assertTrue(module.IsNullableKind(nullable_result))
 
 if __name__ == '__main__':
   unittest.main()