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Manifest v3 use service workers, so there is no RenderFrameHost.

BUG=1168219

Change-Id: Idb777abe6b2be1fff9175271d30dfba7b682eceb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2644100Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845867}