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This CL implements the core part of SecurityTokenSessionController.
The controller observes security tokens and triggers lock / logout when
a token that was used for login is removed, alongside UI implemented in
previous CLs.

This behavior can be controlled by the SecurityTokenSessionBehavior and
SecurityTokenSessionNotificationSeconds policies, which this CL
activates.

This CL also adds browser tests for both policies. In doing so, it also
adds a test for SecurityTokenRestrictionView.

The CL renames the should_fail_certificate_requests property in
TestCertificateProviderExtension to should_provide_certificates,
which more accurately reflects its purpose.

Fixed: 1131450
Change-Id: I8cf4e25fbbcb8ae4ab607ace254a85197f594f5a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632990
Commit-Queue: Fabian Sommer <fabiansommer@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846276}