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Attempted fixes for fuzzer bugs.

Bug: 985995,986029,986007,987476
Change-Id: I3da85945fd722224da9c027f71944c97c823e8db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1718993
Commit-Queue: Madeleine Barowsky <mbarowsky@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683250}