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This allows multiple device.mojom.DeviceService connections to the
Device Service and changes content::GetDeviceService() to safely
maintain independent sequence-local connections.

The new behavior corrects an issue where an inadvertent background-
thread client could trample the global Device Service instance early
in startup, leaving all main-thread clients with a permanently broken
connection.

Bug: 1041804
Change-Id: I3efcb661c9508e1e0007d00f2f9f963c26220de4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2168829Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#763452}