[dialogflow] flake: Operation did not complete within the designated timeout.

[tmatsuo]

build

Log:

Traceback (most recent call last):
  File "/tmpfs/src/github/python-docs-samples/dialogflow/cloud-client/create_document_test.py", line 53, in test_create_document
    'text/html', 'FAQ', 'https://cloud.google.com/storage/docs/faq')
  File "/tmpfs/src/github/python-docs-samples/dialogflow/cloud-client/document_management.py", line 63, in create_document
    document = response.result(timeout=90)
  File "/tmpfs/src/github/python-docs-samples/dialogflow/cloud-client/.nox/py-3-7/lib/python3.7/site-packages/google/api_core/future/polling.py", line 125, in result
    self._blocking_poll(timeout=timeout)
  File "/tmpfs/src/github/python-docs-samples/dialogflow/cloud-client/.nox/py-3-7/lib/python3.7/site-packages/google/api_core/future/polling.py", line 107, in _blocking_poll
    "Operation did not complete within the designated " "timeout."
concurrent.futures._base.TimeoutError: Operation did not complete within the designated timeout.

[tmatsuo]

@nnegrey I'll take this and try to fix it tomorrow, but if you've already started working on this, feel free to take it back.

[tmatsuo]

Build cop bot caught it #3672