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This change allows this API to be used by same origin iframes
in addition to top-level frames.

Bug: 989184
Change-Id: I9c402fb4ce3188ebadbc647c9f781a40a8a3b63e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762917
Commit-Queue: Ayu Ishii <ayui@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693203}