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This CL modifies the return value from navigator.hid.requestDevice
to return an array of HIDDevice objects instead of a single
HIDDevice. If the device chooser is canceled without making a
selection, the promise is resolved with an empty array instead of
rejecting with a DOM exception.

The HID device chooser has also been modified such that each item
in the chooser represents a single physical device. If multiple
logical HID interfaces are exposed by the same physical device,
granting permission to access the single physical device grants
permission to access any logical HID interfaces hosted by the device
that satisfy the chooser filters.

BUG=1036439

Change-Id: Ib67b71bcee32e261d3c9425cfc8bd7173f4ebb8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1966496Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729890}