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Changes browser side implementation to use last committed origin instead
of receiving and checking an origin sent from the renderer.

Bug: 1030892
Change-Id: I5a2c007b80bd1a0a71ac041efc046eb7b8a2317e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978998
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728002}