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SIGSYS is grabbed by the system seccomp filter trap, and SIGSEGV is
grabbed by libsigchain. Both of these need to have their default signal
actions so that the sandbox test framework can interpret process death
accurately.

Cq-Include-Trybots: master.tryserver.chromium.android:android_arm64_dbg_recipe;master.tryserver.chromium.android:android_compile_x64_dbg;master.tryserver.chromium.android:android_compile_x86_dbg
Change-Id: I3879f83bd16d1a71df389fe25d52bb68baacf596
Reviewed-on: https://chromium-review.googlesource.com/984516Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548059}