Further build fix attempt. Completely empty targets are apparently ignored.

BUG=none
TBR=erg@chromium.org

Review URL: https://codereview.chromium.org/156293002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249182 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249182