Switch three more tests to Ozone X11.

testing/buildbot/chromium.chromiumos.json

Index: testing/buildbot/chromium.chromiumos.json
diff --git a/testing/buildbot/chromium.chromiumos.json b/testing/buildbot/chromium.chromiumos.json
index 8bc2d57436dc62d118e3f420b6b7ececdee8010d..dcef2a67c33e84be5eeef1b7ae4222aa7f66d06f 100644
--- a/testing/buildbot/chromium.chromiumos.json
+++ b/testing/buildbot/chromium.chromiumos.json
@@ -43,9 +43,6 @@
         "test": "ash_content_unittests"
       },
       {
-        "args": [
-          "--ozone-platform=headless"
-        ],
         "swarming": {
           "can_use_on_swarming_builders": true
         },
@@ -194,18 +191,12 @@
         "test": "google_apis_unittests"
       },
       {
-        "args": [
-          "--ozone-platform=headless"
-        ],
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "gpu_ipc_service_unittests"
       },
       {
-        "args": [
-          "--ozone-platform=headless"
-        ],
         "swarming": {
           "can_use_on_swarming_builders": true
         },