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Previously VideoCaptureDeviceFactoryFuchsia was logging an ERROR when
DeviceWatcher connection is disconnected, while this error is expected
in some environments. In this change:
  1. Fixed CastRunner to close DeviceWatcher with ZX_ERR_UNAVAILABLE
     when no applications have camera access.
  2. Fixed VideoCaptureDeviceFactoryFuchsia to avoid logging errors for
     ZX_ERR_UNAVAILABLE.
  3. Improved handling of disconnected state in
     VideoCaptureDeviceFactoryFuchsia: now it will reconnect the channel
     in CreateDevice().
  4. Added unittests for (3).

TBR=guidou@chromium.org

Bug: fuchsia:54060
Change-Id: Ib39fd1ef0d1a787f762bcd961196800105e45b97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2246877
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790104}