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This change updates the remaining WebUSB web platform tests to be
multi-global so that the API is also tested in the worker contexts.

Bug: 841510
Change-Id: I9df24f1ae4289ab742db275c34552200bb477b22
Reviewed-on: https://chromium-review.googlesource.com/1089033
Commit-Queue: Ovidio Henriquez <odejesush@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565778}