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This affects the experimental codepath used to retrieve and store
encryption keys. The keys are associated to a user as determined by
identity servers, and using CoreAccountId for such IDs does not work
well on all platforms (namely, ChromeOS).

Bug: 1000146
Change-Id: Iaaab6f1867ac99c026e3474822e86ca5e80f5404
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863803
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706424}