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When test passes, there is no guarantee that the test itself will clean
up all created child processes, so to make the test launcher leak proof,
issues a group kill. This only applies to clang profiling build because
those lingering processes usually indicate prod issues, so we don't
want them to be masked in regular build.

Bug: 1073832
Change-Id: I92ce55d9e5122e4aae18d4c4df46a378fe57159c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2241641Reviewed-by: Erik Staab <estaab@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Reviewed-by: Ilia Samsonov <isamsonov@google.com>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#778535}