Convert jingle_unittests to run exclusively on Swarming

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 94e9024cd4a08e0121c882318956b7e723f3ace0..ad116acd4048c9c901700b24f7cf2a0d869ff477 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -136,6 +136,9 @@
         "test": "ipc_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "jingle_unittests"
       },
       {
@@ -404,6 +407,9 @@
         "test": "ipc_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "jingle_unittests"
       },
       {
@@ -800,6 +806,9 @@
         "test": "ipc_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "jingle_unittests"
       },
       {
@@ -1065,6 +1074,9 @@
         "test": "ipc_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "jingle_unittests"
       },
       {
@@ -1498,6 +1510,9 @@
         "test": "ipc_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "jingle_unittests"
       },
       {