Re-enable win7 LUCI bots

Capacity seems ok to at least re-enable the CI bots. Not sure about
CQ experimental just yet.

Bug: 790648
Change-Id: If02f233778db02ca339ec28c8975968eb0b35ea4
Reviewed-on: https://chromium-review.googlesource.com/1038816Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555270}

infra/config/global/luci-scheduler.cfg

@@ -1615,24 +1615,22 @@ job {
   id: "Win7 (32) Tests"
   # Triggered by "Win Builder"
   acl_sets: "triggered-by-parent-builders"
-  noop: {}
-  # buildbucket: {
-  #   server: "cr-buildbucket.appspot.com"
-  #   bucket: "luci.chromium.ci"
-  #   builder: "Win7 (32) Tests"
-  # }
+  buildbucket: {
+    server: "cr-buildbucket.appspot.com"
+    bucket: "luci.chromium.ci"
+    builder: "Win7 (32) Tests"
+  }
 }
 
 job {
   id: "Win7 Tests (1)"
   # Triggered by "Win Builder"
   acl_sets: "triggered-by-parent-builders"
-  noop: {}
-  # buildbucket: {
-  #   server: "cr-buildbucket.appspot.com"
-  #   bucket: "luci.chromium.ci"
-  #   builder: "Win7 Tests (1)"
-  # }
+  buildbucket: {
+    server: "cr-buildbucket.appspot.com"
+    bucket: "luci.chromium.ci"
+    builder: "Win7 Tests (1)"
+  }
 }
 
 job {