Enable service_unittests on several bot configurations

testing/buildbot/chromium.win.json

Index: testing/buildbot/chromium.win.json
diff --git a/testing/buildbot/chromium.win.json b/testing/buildbot/chromium.win.json
index 957053fe24569f4cacfdd592b5568e57d1b8b216..c49e356d616670148e6bcbc127fa6fc44a2817db 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -373,6 +373,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "service_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "setup_unittests"
       },
       {
@@ -825,6 +831,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "service_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "setup_unittests"
       },
       {
@@ -1292,6 +1304,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "service_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "setup_unittests"
       },
       {
@@ -1700,6 +1718,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "service_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "setup_unittests"
       },
       {