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Previously, GamepadMonitor would only remove itself as a gamepad
consumer if it was active (GamepadStartPolling called with no
corresponding GamepadStopPolling), and would leak if it was
inactive.

This CL ensures GamepadMonitor is always removed if it was ever
added as a gamepad consumer.

BUG=998128

Change-Id: If4f1ac4d1f3b6889acffeb584c2c6dc04b310e31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1804836Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697451}