Remove buildbot memory infra tester from milo

Bug: 790139
Change-Id: Ia6bda22ca94937dcc2a22f9ec6e23f1222fe217b
Reviewed-on: https://chromium-review.googlesource.com/c/1474679
Commit-Queue: Brad Hall <bradhall@google.com>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635771}

infra/config/luci-milo.cfg

@@ -1779,7 +1779,6 @@ consoles {
     short_name: "low"
   }
   builders {
-    name: "buildbot/chromium.android.fyi/Memory Infra Tester"
     name: "buildbucket/luci.chromium.ci/Memory Infra Tester"
     category: "Memory"
   }