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Calling EvictFromBackForwardCache() is better than directly deleting the
RenderFrameHostImpl, because it matches the behavior when the document
is evicted for other reasons (e.g. cache expiration, use of unsupported
features).

Change-Id: If76feb222b2496fb2431dd20892fd46a1f734bd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1809163Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Commit-Queue: Lowell Manners <lowell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697269}