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The identity service fails fast if chrome's refresh tokens are not yet
loaded. However, it does not distinguish between a transient failure due
to the refresh tokens not having loaded yet and a persistent failure due
to not having a refresh token for the requested account. Avoid this by
returning transient errors until the refresh tokens are loaded.

Bug: 855002
Change-Id: I4cfa1d52987a3ed9fbec9a8600c87c535b9e0252
Reviewed-on: https://chromium-review.googlesource.com/1113086Reviewed-by: Stuart Langley <slangley@chromium.org>
Commit-Queue: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570294}