Removes old way to specify files to look for

This was from the first version and is no longer used. Also cleaned up
tests as well.

BUG=none
TEST=none
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/473483002

git-svn-id: http://gyp.googlecode.com/svn/trunk@1965 78cadc50-ecff-11dd-a971-7dbc132099af