sigbjornf@, could you please look into this if possible?

Thank you!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/599c0724311759cb37ed1be9971fa694eee766ca

commit 599c0724311759cb37ed1be9971fa694eee766ca
Author: sigbjornf <sigbjornf@opera.com>
Date: Fri May 13 09:19:37 2016

Avoid race on uninitializing CrossThreadPersistent nodes.

R=
BUG= 611593 ,  611594 

Review-Url: https://codereview.chromium.org/1974233002
Cr-Commit-Position: refs/heads/master@{#393488}

[modify] https://crrev.com/599c0724311759cb37ed1be9971fa694eee766ca/third_party/WebKit/Source/platform/heap/Handle.h
[modify] https://crrev.com/599c0724311759cb37ed1be9971fa694eee766ca/third_party/WebKit/Source/platform/heap/PersistentNode.h

ClusterFuzz has detected this issue as fixed in range 393466:393498.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=4514821990514688

Fuzzer: inferno_twister
Job Type: linux_tsan_chrome_mp
Platform Id: linux

Crash Type: Data race WRITE 8
Crash Address: 0x7d040001a7b0
Crash State:
  blink::WebCryptoResult::reset
  base::internal::PassedWrapper<std::__1::unique_ptr<webcrypto::GenerateKeyState, 
  base::internal::BindState<base::internal::RunnableAdapter<void
  
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_tsan_chrome_mp&range=393466:393498

Unminimized Testcase: https://cluster-fuzz.appspot.com/download/AMIfv97NC2uThc-HdWU8PywUqBvOyjCuFYPZgH887gqbeiQqA_joD_4zJ6RI236ynn2pDPB2_o_DS8o31coQbmm_zapZKDmw7KJTCrNgC-m5ulDkyN6N3cfKB4bZg-1oJp55sA7G_sEEZx-ErwSXz-pFpN4SuQrh68nhAj2TwogLJQf9yac5JaE


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