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While working on live tests I discovered that there is no reliable way
to observe account deletion from cookies during the log out.
AccountReconcilor changes its state to DONE as soon as Gaia log out is
started without waiting for the log out request completion.

This CL adds missing log out observers to GaiaCookieManagerService and
makes AccountReconcilor wait until the log out is done.

NOTE: This CL doesn't block AccountReconcilor on log out completion if
multilogin endpoint is used. This is left as a TODO in code.

Bug: 1054167
Change-Id: If10aede8c5ed10791f4554e91c39526772e075ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832263
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750931}