Add chrome_elf_unittests to chromium_builder_tests and
chrome_elf to All

This will ensure that the bots build the elf tests as expected, and that all Chrome elf targets are part of All.

R=caitkp@chromium.org
BUG=

Review URL: https://codereview.chromium.org/101703004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239806 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239806