Revert of Convert ipc_mojo_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 ebc25d916c549ed6be1784bd1e4212c85ee10aa0..b0b81434346c28dd508a2b84245229df73a15641 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -120,9 +120,6 @@
         "test": "gfx_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "gl_unittests"
       },
       {
@@ -424,9 +421,6 @@
         "test": "gfx_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "gl_unittests"
       },
       {
@@ -856,9 +850,6 @@
         "test": "gfx_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "gl_unittests"
       },
       {
@@ -1614,9 +1605,6 @@
         "test": "gfx_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "gl_unittests"
       },
       {
@@ -1639,9 +1627,6 @@
         "test": "interactive_ui_tests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "ipc_mojo_unittests"
       },
       {