Predator and CL could not provide any possible suspects.
Using Code Search for the file, "web_ax_object_proxy.cc" assigning to the concern owner.

Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/f36960a8d9bc58ac7ea0b0ea6e986bcfdf5e08ef

@aleventhal -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

Automatically applying components based on information from OWNERS files. If this seems incorrect, please apply the Test-Predator-Wrong-Components label.

ClusterFuzz has detected this issue as fixed in range 537260:537261.

Detailed report: https://clusterfuzz.com/testcase?key=6574384247734272

Fuzzer: inferno_twister
Job Type: linux_asan_content_shell_drt
Platform Id: linux

Crash Type: Abrt
Crash Address: 0x03e900000001
Crash State:
  test_runner::WebAXObjectProxy::MisspellingAtIndex
  base::internal::Invoker<base::internal::BindState<std::__1::basic_string<char, s
  gin::internal::Dispatcher<std::__1::basic_string<char, std::__1::char_traits<cha
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_asan_content_shell_drt&range=439705:439765
Fixed: https://clusterfuzz.com/revisions?job=linux_asan_content_shell_drt&range=537260:537261

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6574384247734272

See https://github.com/google/clusterfuzz-tools for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

ClusterFuzz testcase 6574384247734272 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.