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As crbug/946657 has been fixed, fulfill the TODO in the unittest.

Bug: internal: 133880006
Test: Run unit tests.
Change-Id: I7cbc5ac0ea18b19cf584c8842b1d3405fb663e63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724930Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Kehuang Li <kehuangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682354}