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This CL breaks chrome://inducebrowsercrashforrealz

I don't know exactly why the behavior is broken, but it appears that setting a
signal handler for SIGTRAP interferes with breakpad exception handling. See bug
for more details.

Original CL: https://codereview.chromium.org/329423003
Original Commit: d81d222c

TBR=cpu@chromium.org
BUG=402337

Review URL: https://codereview.chromium.org/602793002

Cr-Commit-Position: refs/heads/master@{#296530}