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We already reject activation for error pages, so we now treat a renderer
crash the same. This also resolves a browser crash when attempting to
activate in this state.

Bug: 1106490
Change-Id: I569a24e27ce0128e6204c539a8e7c41041b3ae81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303562
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Reviewed-by: Lucas Gadani <lfg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789574}