Increase maximum number of threads for minidump_stackwalk.
Increase maximum number of threads for minidump_stackwalk.

BUG=

Change-Id: I361d8812df7b2977fe2630289059d31c3c9a4cc3
Reviewed-on: https://chromium-review.googlesource.com/459010
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>

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