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

Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/d851aa1e5290a777a7a82afdbe6c27df2cf82bf2

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

Sorry, my patch only changed PrependWrapper which isn't getting called here.

ClusterFuzz has detected this issue as fixed in range 490022:490107.

Detailed report: https://clusterfuzz.com/testcase?key=5049441362116608

Fuzzer: afl_net_url_request_fuzzer
Job Type: afl_chrome_asan
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000038
Crash State:
  HasSwitch
  base::CommandLine::HasSwitch
  base::SysInfo::AmountOfPhysicalMemory
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=afl_chrome_asan&range=489460:489535
Fixed: https://clusterfuzz.com/revisions?job=afl_chrome_asan&range=490022:490107

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5049441362116608


See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.md 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 5049441362116608 is verified as fixed, so closing issue as verified.

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