No-op death test if not supported.

Only ASSERT_DEATH if supported.

BUG=none

Review URL: https://codereview.chromium.org/39053003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230765 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230765