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If set, the new argument allows //testing/libfuzzer/unittest_main.cc to
be used as fuzzer test driver even if use_libfuzzer and use_afl are both
false.

Change-Id: I3ce5ee97ce244ba1e09393ddf0305881688ec64d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138434Reviewed-by: Jonathan Metzman <metzman@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Jonathan Metzman <metzman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757602}