Use a device ID that is only valid for the life of the current frame when a Continuity camera (iPhone) is not the system preferred camera. This prevents a script from remembering the ID of a Continuity camera (iPhone) the user selected when it was setup and in position, and reusing it automatically later when the phone is in the user's pocket.
rdar://100335624
Pull request: https://github.com/WebKit/WebKit/pull/5919
Committed 256161@main (0ee91ab89adb): <https://commits.webkit.org/256161@main> Reviewed commits have been landed. Closing PR #5919 and removing active labels.