GitLab

Centralizing the logic for checking for supported environments for
Windows Share related functionality. Also a small refactor to the
scoped_fake_data_transfer_manager_interop to make its initialization
explicit.

Bug: 1035527
Change-Id: Idee6f647745f95d415325a44856f09c5ff959af1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495397Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Hoch Hochkeppel <mhochk@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#820939}