Predator and CL could not provide any possible suspects.
Using Code Search for the file, "permissionutils.cpp" assigning to the concern owner who might be related.

Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/ec8a59378bf5e15360c3728e35ab5b57ca8fd495

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

This probably isn't a true dup of 759379 but something for dmazzoni@ to fix before relanding their change.

ClusterFuzz has detected this issue as fixed in range 497997:498029.

Detailed report: https://clusterfuzz.com/testcase?key=6314142482038784

Fuzzer: inferno_twister
Job Type: windows_syzyasan_content_shell
Platform Id: windows

Crash Type: Null-dereference
Crash Address: 0x00000003
Crash State:
  blink::ConnectToPermissionService
  blink::AXObjectCacheImpl::AddPermissionStatusListener
  blink::AXObjectCacheImpl::AXObjectCacheImpl
  
Memory Tool: SYZYASAN

Regressed: https://clusterfuzz.com/revisions?job=windows_syzyasan_content_shell&range=496760:496804
Fixed: https://clusterfuzz.com/revisions?job=windows_syzyasan_content_shell&range=497997:498029

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6314142482038784

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.