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There were some reported oom's, so curb size to something reasonable.
This CL only affects the fuzzer.

Bug: 1018506, 1018522
Change-Id: I051da49d510fb108dea95925104c839d11ef5aa2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1883871Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Kevin Bailey <krb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709902}