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This CL is a code cleanup of the multilogin code.
The code is split in two new classes, and should be a lot clearer.

The retry logic has been revisited, and in particular a potential
infinite loop was removed:
in the previous code, a "invalid tokens" response was always retried.
The code was relying on Android (GMSCore) to invalidate and evict the access
token, so that the same token is not retried endlessly.
However, in case of a GMSCore bug, an infinite loop may happen.
We don't have a proof that this was happening, but as we have seen a large
number of errors coming from a few devices, this CL adds protection against
this and only retries once.

Change-Id: I097b6104f12f6abb65b1a30f75d753cef6610c17
Bug: 957536
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1572131
Commit-Queue: David Roger <droger@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654826}