Convert ipc_mojo_unittests to run exclusively on Swarming

testing/buildbot/chromium.memory.fyi.json

Index: testing/buildbot/chromium.memory.fyi.json
diff --git a/testing/buildbot/chromium.memory.fyi.json b/testing/buildbot/chromium.memory.fyi.json
index 0303b2e8c40af73f1bfaac2c63eafb3dd6bf2137..17b714a4e0c096030a1954ea1f33e2bde1f23010 100644
--- a/testing/buildbot/chromium.memory.fyi.json
+++ b/testing/buildbot/chromium.memory.fyi.json
@@ -117,6 +117,9 @@
         "test": "gcm_unit_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "gl_unittests"
       },
       {
@@ -136,6 +139,9 @@
         "test": "interactive_ui_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ipc_mojo_unittests"
       },
       {
@@ -381,6 +387,9 @@
         "test": "gfx_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "gl_unittests"
       },
       {
@@ -399,6 +408,9 @@
         "test": "interactive_ui_tests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ipc_mojo_unittests"
       },
       {
@@ -634,6 +646,9 @@
         "test": "gfx_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "gl_unittests"
       },
       {
@@ -646,6 +661,9 @@
         "test": "gpu_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ipc_mojo_unittests"
       },
       {