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Currently we only stop the activity indicator spinning animation when
the user presses 'Cancel' on the user sign-in screen. This otherwise
infinite animation causes deadlocks in EarlGrey during the
authentication flow.

We move all activity indicator handling to the user sign-in delegate.

Bug: 1005509
Change-Id: Ia775ab32346d8b67ef4842d5952a250d3208a11c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144014Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Nohemi Fernandez <fernandex@chromium.org>
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760459}