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Previously we set the limit to zero, meaning no limit, but FFmpeg 4.3
will not allocate at all with that setting.

Changed to std::numeric_limits<size_t>::max().

Bug: 1095962
Change-Id: I96820c21f794f2814e955ee75ff22dfd31804c29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2349405Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796966}