This is the second attempt of
https://codereview.chromium.org/2677563006/

DumpWithoutCrash should not be enabled for child processes on Android
because the browser is not set up to read multiple crash reports for the
same child process. So enabling DumpWithoutCrash could lead to real crash
reports getting dropped.

This new implementation just crashes the child process to cause a crash
report to be generated.

Note this does not replace the need for
KillChildUncaughtExceptionHandler, which is installed much earlier
during start up and is designed to not cause hangs for any problems
during start up as well.

BUG=680775

Review-Url: https://codereview.chromium.org/2687193003
Cr-Commit-Position: refs/heads/master@{#449632}