Previously it incorrectly used the current frame origin instead of the
seller origin for the attestation check.

(cherry picked from commit aaeb9b2e55d020b97a46c3078b51c6ec3d95e41d)

Bug: 1499107,b:309014378
Change-Id: Ie09f82d2ca8cbe9c7441e1289323c96e8b4e3d9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5003486
Commit-Queue: Caleb Raitto <caraitto@chromium.org>
Reviewed-by: Caleb Raitto <caraitto@chromium.org>
Auto-Submit: Russ Hamilton <behamilton@google.com>
Cr-Original-Commit-Position: refs/heads/main@{#1219668}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5007337
Commit-Queue: Russ Hamilton <behamilton@google.com>
Cr-Commit-Position: refs/branch-heads/6045@{#1231}
Cr-Branched-From: 905e8bdd32d891451d94d1ec71682e989da2b0a1-refs/heads/main@{#1204232}