Unmirror win_chrome_official to move to internal instead.

Bug: 731383
Change-Id: Id563bd36de50c7685a524336906fc8542d1c6f51
Reviewed-on: https://chromium-review.googlesource.com/1188451Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Commit-Queue: Eric Foo <efoo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586073}

infra/config/global/cr-buildbucket.cfg

@@ -2856,7 +2856,6 @@ buckets {
     builders { mixins: "win-angle-try" name: "win_angle_x64_rel_ng" }
     builders { mixins: "win-angle-try" name: "win_angle_x64_deqp_rel_ng" }
     builders { mixins: "win-try" name: "win_archive" }
-    builders { mixins: "win-try" name: "win_chrome_official" }
     builders {
       mixins: "win-try"
       mixins: "goma-j150"

infra/config/global/luci-milo.cfg

@@ -4320,9 +4320,6 @@ consoles {
   builders {
     name: "buildbot/tryserver.chromium.win/win_archive"
   }
-  builders {
-    name: "buildbot/tryserver.chromium.win/win_chrome_official"
-  }
   builders {
     name: "buildbot/tryserver.chromium.win/win_chromium_compile_dbg_ng"
   }