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This CL changes HIDCollectionInfo, HIDReportInfo, and HIDReportItem
interfaces to dictionaries for easier logging with JSON and to avoid
polluting the window web namespace.

Spec: https://github.com/WICG/webhid/issues/22
Test: https://webhid-collections.glitch.me/

Change-Id: Ife8d089505312bba9f42e5d8fb1c466f44bd8e45
Bug: 890096
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398541Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#812626}