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This is a reland of 1ff37758

Original change's description:
> Multi-global WebUSB WPT for window and worker
>
> This change updates the existing web platform tests for WebUSB to use
> multi-global tests to test the API in the supported contexts. The
> change updates the following tests:
> * idlharness
> * usb
> * usbConnectionEvent
>
> Bug: 841510
> Change-Id: I6b118aa4121109cd6a48054c2ebc69b831660afc
> Reviewed-on: https://chromium-review.googlesource.com/1087209
> Reviewed-by: Reilly Grant <reillyg@chromium.org>
> Commit-Queue: Ovidio Henriquez <odejesush@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#564981}

Bug: 841510
Change-Id: Ie354fdd54a4cd94a4801ee634c8d3263e0aa6e93
Reviewed-on: https://chromium-review.googlesource.com/1089647
Commit-Queue: Ovidio Henriquez <odejesush@chromium.org>
Reviewed-by: Chong Zhang <chongz@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567290}