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Currently, frame is detected as iframe in `destination` which will be fixed in https://bugs.chromium.org/p/chromium/issues/detail?id=1019716.

Bug: 1011724
Change-Id: I722bcbccac3bfc914844711fb6feb1e21f859a6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1886863Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Yifan Luo <lyf@google.com>
Cr-Commit-Position: refs/heads/master@{#712500}