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 who might be related.

@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 558997:559000.

Detailed report: https://clusterfuzz.com/testcase?key=4801670029770752

Fuzzer: inferno_twister
Job Type: linux_asan_content_shell_drt
Platform Id: linux

Crash Type: Abrt
Crash Address: 0x053900000001
Crash State:
  content::RenderThreadImpl::RequestNewLayerTreeFrameSink
  content::RenderWidget::RequestNewLayerTreeFrameSink
  content::RenderWidgetCompositor::RequestNewLayerTreeFrameSink
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_asan_content_shell_drt&range=473072:473106
Fixed: https://clusterfuzz.com/revisions?job=linux_asan_content_shell_drt&range=558997:559000

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4801670029770752

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 4801670029770752 is verified as fixed, so closing issue as verified.

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