bigquery: remove redundant test
bigquery: remove redundant test

Change-Id: Id0783118c2daabd7e568402cd103276178db8806
Reviewed-on: https://code-review.googlesource.com/8732
Reviewed-by: Jun Mukai <7519e7503d434ad998e9a85ea6f0976705697504@google.com>

googleapis/google-cloud-go,googleapis/google-cloud-go,michael-grosshans/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go,michael-grosshans/google-cloud-go