message: tfdbg: deflake session_debug_file_test
  by disabling grappler in the test.
diff: @@ -988,7 +988,7 @@ class SessionDebugTestBase(test_util.TensorFlowTestCase):
  def testWatchingVariableUpdateOpsSeesUpdatedValues(self):
  """Watch output slots on Variable-updating ops, with no emitted edges."""
  - with session.Session() as sess:
  + with session.Session(config=no_rewrite_session_config()) as sess:
  u_init = constant_op.constant(10.0)
  u = variables.Variable(u_init, name="gdo/u")
  v_init = constant_op.constant(20.0)
  