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The webview's cookie jar isn't reset between getAuthToken() calls
within a Chrome session. This can lead to sub-optimal experience when
the user sees on the consent page the accounts they were previously
signed in.

This behavior is also problematic if we decide to roll back the new
consent flow experiment. After the experiment rollback, the user
will see all their Chrome accounts whereas Chrome should display only
a primary account.

This CL cleans webview's cookies before starting the legacy consent
flow.

Fixed: 1075929
Change-Id: Ia502ca74d5763c206c680772c43764476b74c5e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2168879
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763445}