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This CL is a part of moving access token management to
OAuth2AccessTokenManager.

It is specifically a step toward folding O2TS into PO2TS
now that O2TS is only one subclass of PO2TS.

It introduces OnAccessTokenRemoved in O2ATMtest to
test that StartRequest triggers
DiagnosticsObserver::OnAccessTokenRemoved which
is triggered by ClearCacheForAccount, ClearCache and
InvalidateAccessToken.

Bug: 967598
Change-Id: Icc49cdc4848ca1e2891b21bb0ac945a9902f2648
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1728710
Commit-Queue: Julie Jeongeun Kim <jkim@igalia.com>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683158}