chromevox_tests - BackgroundTest.NextNamespaces is flaky

https://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Ozone%20Tests%20%281%29/builds/33246

[428/428] BackgroundTest.NextNamespaces (2620 ms)
Retrying 1 test (retry #3)
[ RUN      ] BackgroundTest.NextNamespaces
[16799:16799:0726/133249:WARNING:chrome_browser_main_chromeos.cc(332)] Running as stub user with profile dir: test-user
[16799:16844:0726/133250:WARNING:oom_kills_monitor.cc(163)] Open /dev/kmsg failed: Permission denied
[16799:16848:0726/133250:WARNING:local_extension_cache.cc(259)] Extensions will not be installed from update URLs until /tmp/.org.chromium.Chromium.fmNhMH/dYrnN0a/stub_device_local_extension_cache/.initialized exists.
[16799:16799:0726/133250:WARNING:child_account_service.cc(302)] User instance wasn't found while setting child account flag.
[16799:16820:0726/133250:WARNING:freezer_cgroup_process_manager.cc(59)] Cgroup freezer does not exist or is not writable. Unable to freeze renderer processes.
[16830:16830:0726/133250:ERROR:interface_registry.cc(80)] Failed to locate a binder for interface: mojom::ResourceUsageReporter
[16799:16799:0726/133251:INFO:CONSOLE(316)] "Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.", source: chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromeVox2ChromeBackgroundScript.js (316)
[16799:16820:0726/133252:ERROR:component_loader.cc(94)] Can't load /usr/share/chromeos-assets/speech_synthesis/patts/manifest.json: Manifest file is missing or unreadable.
[16799:16799:0726/133252:INFO:CONSOLE(861)] "Speak (Q) category=nav "Alert"", source: chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromeVox2ChromeBackgroundScript.js (861)
[16799:16799:0726/133252:INFO:CONSOLE(861)] "Speak (Q) category=nav "Connected to eth1"", source: chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromeVox2ChromeBackgroundScript.js (861)
[16799:16799:0726/133252:INFO:CONSOLE(733)] "Earcon alert_nonmodal", source: chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromeVox2ChromeBackgroundScript.js (733)
[16799:16799:0726/133252:INFO:CONSOLE(861)] "Speak (Q) category=nav """, source: chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromeVox2ChromeBackgroundScript.js (861)
[19:19:0726/133252:WARNING:webmediaplayer_impl.cc(350)] Using MultibufferDataSource
[3,663357248:20:32:52.283193] Native Client module will be loaded at base address 0x0000373f00000000
[16799:16799:0726/133252:INFO:CONSOLE(1691)] "Injecting into 2", source: chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromeVox2ChromeBackgroundScript.js (1691)
[16799:16799:0726/133252:INFO:CONSOLE(861)] "Speak (Q) category=nav "Alert"", source: chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromeVox2ChromeBackgroundScript.js (861)
[16799:16799:0726/133252:INFO:CONSOLE(861)] "Speak (Q) category=nav "ChromeVox Updated
Press ChromeVox o, n to learn more about ChromeVox Next.
"", source: chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromeVox2ChromeBackgroundScript.js (861)
[16799:16799:0726/133252:INFO:CONSOLE(733)] "Earcon alert_nonmodal", source: chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromeVox2ChromeBackgroundScript.js (733)
[16799:16799:0726/133252:INFO:CONSOLE(861)] "Speak (Q) category=nav """, source: chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromeVox2ChromeBackgroundScript.js (861)
[16799:16799:0726/133252:INFO:CONSOLE(861)] "Speak (Q) "ChromeVox spoken feedback is ready"", source: chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromeVox2ChromeBackgroundScript.js (861)
[16799:16799:0726/133252:INFO:CONSOLE(7709)] "Running TestCase BackgroundTest.NextNamespaces", source: background_test.extjs (7709)
[16799:16799:0726/133252:INFO:CONSOLE(861)] "Speak (I) "Switched to ChromeVox Next"", source: chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromeVox2ChromeBackgroundScript.js (861)
[19:19:0726/133252:WARNING:logging_native_handler.cc(62)] no targetTree to destroy
[16799:16799:0726/133252:INFO:CONSOLE(1693)] "Could not inject into tab", source: chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromeVox2ChromeBackgroundScript.js (1693)
[16799:16799:0726/133252:WARNING:pref_notifier_impl.cc(27)] pref observer found at shutdown plugins.always_authorize
[16799:16799:0726/133252:WARNING:pref_notifier_impl.cc(27)] pref observer found at shutdown plugins.allow_outdated
[16799:16799:0726/133252:WARNING:pref_notifier_impl.cc(27)] pref observer found at shutdown printing.enabled
[16799:16907:0726/133252:WARNING:audio_sync_reader.cc(132)] AudioSyncReader::Read timed out, audio glitch count=1