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In r604873 support for revoking USB permission in real time was added
but broke this tab indicator behavior by closing the mojo::Receiver for
the UsbDeviceClient interface on device disconnection without updating
the tab indicator state.

This change fixes that behavior by having WebUsbServiceImpl track the
open state of each UsbDevice pipe it creates and updating the tab
indicator state if one of them is forcibly closed while the device is
open.

This change allows connection state tracking in UsbTabHelper to be
simplified.

Additional unit tests for this behavior have been added.

Bug: 1064467
Change-Id: I9747d48428fc3daaf921b6763060ba16007004ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2122461Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754751}