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This CL attempts to fix a crash that was happening when attempting to
use a render frame host that might have been deleted or was in the
process of being deleted.

Bug: 1140163
Change-Id: I9abeaad7c84fa0409c5c152e69610da1db4b44c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485585
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819147}