Revert 225992 "Add unit tests for AppListServiceImpl."

This change appears to be causing the FastShutdown test in unit_tests to fail
on the Linux Clang (dbg) bot.

> Add unit tests for AppListServiceImpl.
> 
> TBR=sail@chromium.org
> 
> Review URL: https://codereview.chromium.org/24707002

TBR=koz@chromium.org

Review URL: https://codereview.chromium.org/25269004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226010 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226010