The DumpAccessibilityTreeTest.AccessibilityModalDialogInIframeClosed test has just failed on Android GN bot:

[ RUN      ] DumpAccessibilityTreeTest.AccessibilityModalDialogInIframeClosed
[WARNING:dns_config_service_posix.cc(306)] Failed to read DnsConfig.
[ERROR:devtools_http_handler.cc(229)] Cannot start http server for devtools. Stop devtools.
[ERROR:shell.cc(302)] Error: Instance: exe:chrome attempting to register an instance for a process it created for target: exe:chrome_renderer without the mojo:shell{client_process} capability class.
[ERROR:layer_tree_host_impl.cc(2211)] Forcing zero-copy tile initialization as worker context is missing
[INFO:dump_accessibility_browsertest_base.cc(200)] Testing: /storage/emulated/0/content/test/data/accessibility/html/modal-dialog-in-iframe-closed.html (native accessibility tree for this platform)
../../content/browser/accessibility/dump_accessibility_browsertest_base.cc:339: Failure
Value of: is_different
  Actual: true
Expected: false
[ERROR:dump_accessibility_browsertest_base.cc(364)] Diff:
* Line Expected
- ---- --------
     1 android.webkit.WebView focusable focused scrollable
     2 ++android.view.View
     3 ++++android.view.View clickable name='Test for modal dialog closed in an iframe. '
     4 ++++android.view.View
*    5 ++++++android.view.View focusable scrollable
     6 ++++++++android.view.View
     7 ++++++++++android.widget.Button role_description='button' clickable focusable name='I am a non-inert button!'
     8 <-- End-of-file -->

Actual
------
android.webkit.WebView focusable focused scrollable
++android.view.View
++++android.view.View clickable name='Test for modal dialog closed in an iframe. '
++++android.view.View
<-- End-of-file -->
[  FAILED  ] DumpAccessibilityTreeTest.AccessibilityModalDialogInIframeClosed, where TypeParam =  and GetParam() =  (556 ms)

Don't see anything obvious on the CL range:
https://chromium.googlesource.com/chromium/src/+log/d26beba1c03ca7eff59252cf6f08080d1b603310%5E..f76b5035ab7d677198849bff6cd5c3aa17d78468?pretty=oneline

Assigned to falken@, you seem to be familiar with this test.