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This ensures that the |RenderFrameHost|'s Policy Container is properly
initialized when a speculative |RenderFrameHost| is committed early
following a crash of the RenderProcess.
This allows the following navigation to have a properly initialized
|PolicyContainerHost|.

Change-Id: Ie8274bdcbdebcf5a0b9b7023ef5c137ab9688ecc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536466Reviewed-by: Antonio Sartori <antoniosartori@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Commit-Queue: Pâris Meuleman <pmeuleman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843001}