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Since a RenderWidgetHostView is destroyed when a renderer process crashes, it
is necessary to null-check it before de-referencing it.
This CL is based on nick@'s CL: https://chromium-review.googlesource.com/c/chromium/src/+/956624

Bug: 859215
Change-Id: I029d3615fee56c9cd2287ee816b269338802937c
Reviewed-on: https://chromium-review.googlesource.com/1234873
Commit-Queue: Lucas Gadani <lfg@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592883}