mash: Re-enable mash_browser_tests in ozone builder.

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 584f67885e16d04f6f650b5faff81c0033b46582..11cb186fb98f5975741909499477459b8f84c52c 100644
--- a/testing/buildbot/chromium.chromiumos.json
+++ b/testing/buildbot/chromium.chromiumos.json
@@ -111,6 +111,19 @@
         "test": "base_unittests"
       },
       {
+        "args": [
+          "--override-use-gl-with-osmesa-for-tests",
+          "--run-in-mash",
+          "--test-launcher-filter-file=src/testing/buildbot/filters/mash.browser_tests.filter",
+          "--use-test-config"
+        ],
+        "name": "mash_browser_tests",
+        "swarming": {
+          "can_use_on_swarming_builders": false
+        },
+        "test": "browser_tests"
+      },
+      {
         "swarming": {
           "can_use_on_swarming_builders": true
         },