Remove three builders from the MB configs for tryserver.blink.
Remove three builders from the MB configs for tryserver.blink.

Now that they've been removed.

R=aneeshm@chromium.org
BUG=481692

Review URL: https://codereview.chromium.org/1870213002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#386523}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk