Looks like the same as bug 656453

ClusterFuzz has detected this issue as fixed in range 435933:436002.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6213895477002240

Fuzzer: inferno_layout_test_unmodified
Job Type: mac_asan_chrome
Platform Id: mac

Crash Type: Use-after-poison READ 8
Crash Address: 0x7eaf9e8c3900
Crash State:
  content::WebFileWriterBase::DidWrite
  base::internal::Invoker<base::internal::BindState<base::Callback<void
  content::WebFileWriterImpl::WriterBridge::PostTaskToWorker
  
Recommended Security Severity: High

Regressed: https://cluster-fuzz.appspot.com/revisions?job=mac_asan_chrome&range=422396:422398
Fixed: https://cluster-fuzz.appspot.com/revisions?job=mac_asan_chrome&range=435933:436002

Minimized Testcase (0.81 Kb): https://cluster-fuzz.appspot.com/download/AMIfv97Qv7usg6CJuXVtlRFP14WxHGKKoH_OkLGk18pU8JGQ8VLmSeM1bgGihGLN-D4_lD93wzLXAMUBeG0Mq-K-1ZWkgoXL1FJn8RIPZ6xiFSkAKoEZI7UrCOXZ3eOebP1F8N2apzdHESszBFSub9vBfpcrpj5oMQ?testcase_id=6213895477002240

See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

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

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot