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This feature will still be controlled by frame messaging.

Bug: 881364
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Ibdf1c1c6ed616475a1d6d2c45929831a2c5fe5e9
Reviewed-on: https://chromium-review.googlesource.com/1245728Reviewed-by: Eric Noyau <noyau@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594373}