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When an extension message is received, we check `MessageSender.id` to
disallow requests from unknown clients.  Unfortunately,
`MessageSender.id` is currently not trustworthy (issue 982361) and
therefore this CL switches to using `MessageSender.origin` instead.

Bug: 10321587
Change-Id: I3729a407bef47e5ca4212ee3fe748b89c8d16a50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031526Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737518}