[luci-milo] Remove the buildbot master.chromium configs

Bug: 790277, 790274, 790292, 790281, 790269
Change-Id: I48e7869ce0974c36149a18653c39c0c7c2ff5502
Reviewed-on: https://chromium-review.googlesource.com/1092041
Commit-Queue: Ryan Tseng <hinoka@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565685}

infra/config/global/luci-milo.cfg

@@ -309,31 +309,26 @@ consoles {
   ref: "refs/heads/master"
   manifest_name: "REVISION"
   builders {
-    name: "buildbot/chromium/Win"
     name: "buildbucket/luci.chromium.ci/Win"
     category: "chromium|win"
     short_name: "32"
   }
   builders {
-    name: "buildbot/chromium/Win x64"
     name: "buildbucket/luci.chromium.ci/Win x64"
     category: "chromium|win"
     short_name: "64"
   }
   builders {
-    name: "buildbot/chromium/Mac"
     name: "buildbucket/luci.chromium.ci/Mac"
     category: "chromium"
     short_name: "mac"
   }
   builders {
-    name: "buildbot/chromium/Linux x64"
     name: "buildbucket/luci.chromium.ci/Linux x64"
     category: "chromium"
     short_name: "lin"
   }
   builders {
-    name: "buildbot/chromium/Android"
     name: "buildbucket/luci.chromium.ci/Android"
     category: "chromium"
     short_name: "and"
@@ -1543,42 +1538,6 @@ consoles {
   repo_url: "https://chromium.googlesource.com/chromium/src"
   ref: "refs/heads/master"
   manifest_name: "REVISION"
-  builders {
-    name: "buildbot/chromium/Android"
-    name: "buildbucket/luci.chromium.ci/Android"
-    short_name: "an"
-  }
-  builders {
-    name: "buildbot/chromium/Linux x64"
-    name: "buildbucket/luci.chromium.ci/Linux x64"
-    short_name: "lnx"
-  }
-  builders {
-    name: "buildbot/chromium/Mac"
-    name: "buildbucket/luci.chromium.ci/Mac"
-    short_name: "mac"
-  }
-  builders {
-    name: "buildbot/chromium/Win"
-    name: "buildbucket/luci.chromium.ci/Win"
-    category: "win"
-    short_name: "32"
-  }
-  builders {
-    name: "buildbot/chromium/Win x64"
-    name: "buildbucket/luci.chromium.ci/Win x64"
-    category: "win"
-    short_name: "64"
-  }
-}
-
-consoles {
-  header_id: "chromium"
-  id: "luci.chromium"
-  name: "luci.chromium"
-  repo_url: "https://chromium.googlesource.com/chromium/src"
-  ref: "refs/heads/master"
-  manifest_name: "REVISION"
   include_experimental_builds: true
   builders {
     name: "buildbucket/luci.chromium.ci/Android"