message: Fix fused conv test.
  cl/248437673 seemed to break it. This CL tries to pass use_gpu to self.session.
diff: @@ -318,6 +318,7 @@ class FusedConv2DBiasActivationTest(object):
  tensors = []
  ref_tensors = []
  for (data_format, use_gpu) in _GetTestConfigs():
  + with ops.device("/gpu:0" if use_gpu else "/cpu:0"):
  for dtype in self._DtypesToTest(use_gpu):
  for filter_format in self._FilterFormatsToTest(use_gpu):
  result, expected = self._SetupValuesForDevice(
  