Predator and CL did not provide any possible suspects.
Using Code Search for the file, "system_menu_model_builder.cc" assigning to concern owner from GIT Blame.

Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/e7d888132fc2fd641622d86b2b4c92fa4d01b124

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

ClusterFuzz has detected this issue as fixed in range 488838:488849.

Detailed report: https://clusterfuzz.com/testcase?key=5305136670048256

Fuzzer: meacer_extension_apis
Job Type: windows_syzyasan_chrome
Platform Id: windows

Crash Type: Null-dereference
Crash Address: 0x00000003
Crash State:
  IsChromeSettingsAppOrPopupWindow
  SystemMenuModelBuilder::BuildSystemMenuForAppOrPopupWindow
  SystemMenuModelBuilder::BuildMenu
  
Memory Tool: SYZYASAN

Regressed: https://clusterfuzz.com/revisions?job=windows_syzyasan_chrome&range=367319:367361
Fixed: https://clusterfuzz.com/revisions?job=windows_syzyasan_chrome&range=488838:488849

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5305136670048256


Additional requirements: Requires Gestures

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 5305136670048256 is verified as fixed, so closing issue as verified.

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