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Updates TestingProfile for better support of ephemeral Guest profiles.

Please see go/ephemeral-guest-profiles for more context.

Bug: 1125474
Change-Id: Ibfce3a9df1ab3b17a517b05635c11a4d4dce86b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2494721Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820800}