Remove linux_precise_blink_* builders. BUG=660580 Change-Id: Ia6706b8392aa5b61bad442cbc3a5eeff4a0e66e8 Reviewed-on: https://chromium-review.googlesource.com/412261 Reviewed-by: Dirk Pranke <dpranke@chromium.org> Commit-Queue: Quinten Yearsley <qyearsley@chromium.org>