Setuid sandbox: exit(2) on SIGABRT

The setuid sandbox waits on its one child and then dies
afterwards.

When receiving SIGABRT, instead of dumping core, simply exit the
process. There is no interesting information to be gathered from
knowing that the process is inside waitid(2), one should look at
the child process instead.

This patch is in hope to reduce red herrings.

BUG=334345
TBR=jorgelo

Review URL: https://codereview.chromium.org/167293004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251391 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251391
[WebsiteSettings] Set view to null on manager to ensure no stale access.

R=leng@chromium.org, markusheintz@chromium.org
BUG=343234

Review URL: https://codereview.chromium.org/162713003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251392 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251392