Revert "Switch to new blink trybots."

This reverts commit 5b968313207a7ea68ea0954e318ecfb09346ffc0.

TBR=eseidel@chromium.org
BUG=

Review URL: https://codereview.chromium.org/19895002

git-svn-id: svn://svn.chromium.org/blink/trunk@154600 bbb929c8-8fbe-4397-9dbb-9b2b20218538