Point builder links in sheriff-o-matic to the builder, not the earliest failing build.

This is clearly the behavior everyone expects and wants.

NOTRY=true
BUG=415800

Review URL: https://codereview.chromium.org/603063003

git-svn-id: svn://svn.chromium.org/blink/trunk@183378 bbb929c8-8fbe-4397-9dbb-9b2b20218538