Remove buildbot/chromium.linux/Linux Tests

Cleanup that was missed previously.

Bug: 822438
Change-Id: I070007a99f561debac65858da171d3b71b069211
Reviewed-on: https://chromium-review.googlesource.com/990482Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Ryan Tseng <hinoka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547479}

infra/config/global/luci-milo.cfg

@@ -892,7 +892,6 @@ consoles: {
     short_name: "bld"
   }
   builders: {
-    name: "buildbot/chromium.linux/Linux Tests"
     name: "buildbucket/luci.chromium.ci/Linux Tests"
     category: "release"
     short_name: "tst"
@@ -914,7 +913,6 @@ consoles: {
     short_name: "32"
   }
   builders: {
-    name: "buildbot/chromium.linux/Linux Tests (dbg)(1)"
     name: "buildbucket/luci.chromium.ci/Linux Tests (dbg)(1)"
     category: "debug|tester"
     short_name: "64"