Remove remaining references to test_shell_tests now that the bots have been updated.

BUG=126514
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/14841004

Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 6e23edbce20d371e9d7f34746471b47ca0651cc0
1 file changed