Break the circular dependency in the new mojom bindings generation pipeline.

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
-  import mojom_files_mojom
-  import mojom_types_mojom
+  from generated import mojom_files_mojom
+  from generated import mojom_types_mojom
   bindings_imported = True
 except ImportError:
   bindings_imported = False
 
 
 @unittest.skipUnless(bindings_imported, 'Could not import python bindings.')
 class TranslateFileGraph(unittest.TestCase):
 
   def test_basics(self):
     g = mojom_files_mojom.MojomFileGraph()
@@ skipping 664 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()