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Some requests, e.g. requests for service worker updates, are not
associated with a WebContents. In these cases Clear-Site-Data returns
early and doesn't mark its task as finished, which leads to hanging
requests.
This CL fixes the hanging requests but does not actually perform the
site data deletion. That will be fixed in a followup CL.

Bug: 898465
Change-Id: I99bbf4339f7b123d4a46552e9f117d4d95b7ec67
Reviewed-on: https://chromium-review.googlesource.com/c/1346468
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611625}