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We need to wait until |camera_info_| is updated in
OnGotCameraInfoOnIpcThread() before we fire ProcessDevicesChanged() to
prevent the race condition.

To easily reproduce the race without this CL, add
--disable-features=MojoVideoCapture as the command line argument of
Chrome.

BUG=b:118418068,b:118408452,b:64996728,b:77833131
TEST=10.times do
       Plug the external camera
       Check the external camera is shown in settings
       Unplug the extencal camera
       Check the external camera is not shown in settings
     end

Change-Id: I3774c456099724f2bb5ac2d21caf3229d0045a4e
Reviewed-on: https://chromium-review.googlesource.com/c/1345677Reviewed-by: Ricky Liang <jcliang@chromium.org>
Commit-Queue: Shik Chen <shik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609934}