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In the past, base::File object was passed to the CDM process and it
read/write using the handle. Now that all the reading/writing is done
in the browser process, it's no longer a concern that the handle can
exist after the underlying file was deleted.
The test is removed while removing usages of CreateOrOpen() function
that is on deprecation path.

Bug: 936722
Change-Id: Ic2ab6ffece24118e3f7384b440b77cecd12ddc5a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1768590
Auto-Submit: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692383}