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Two tokens were missing from the list: allow-orientation-lock and
allow-presentation. In addition, allow-downloads was reported as being
supported, when it actually depends on a runtime flag which is off by
default.

Bug: 739787
Change-Id: Iadea9ebf45c7c0b63e8775f5c10aaa0c764a6807
Reviewed-on: https://chromium-review.googlesource.com/1005414
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550673}