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To simplify fixing Clear-Site-Data, I move some of the code that was
duplicated for the network_service into a shared location.

Bug: 898465
Change-Id: I25eac82e7a6f3481b03ac88946a1e7a6828cbfc9
Reviewed-on: https://chromium-review.googlesource.com/c/1350971
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611633}