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After deprecation of gaia_auth extension in
 https://codereview.chromium.org/2686683002, there is no more
listener of a clearOldAttempts message from GAIA in chrome codebase.

So in current code the only effect of this message is warning in JS
console triggered by authenticator.js:637 during tests.

Change-Id: I1d734b99c44c8f48d41dac737325cb4e859aa057
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1534166Reviewed-by: Roger Tawa <rogerta@chromium.org>
Commit-Queue: Denis Kuznetsov <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644747}