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Find it and CL did not provide any possible suspect.
Using Code Search for the file, "XMLDocumentParser.cpp" assigning to the concern owner.
Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/4066a12bab519a1bb7afd04e0a1499c549bd491b

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

This doesn't look related to my changes. Routing to Kouhei since IIRC document parsing code structure may be in flux anyway (merging HTML & XML parser?)

+parser tag

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fdf397d40c16b0bc3f926d06faa093439b5f8ae3

commit fdf397d40c16b0bc3f926d06faa093439b5f8ae3
Author: kouhei <kouhei@chromium.org>
Date: Mon Dec 19 04:02:25 2016

parser: Invalid xml version on prolog shouldn't crash

BUG= 628016 

Review-Url: https://codereview.chromium.org/2583043002
Cr-Commit-Position: refs/heads/master@{#439402}

[add] https://crrev.com/fdf397d40c16b0bc3f926d06faa093439b5f8ae3/third_party/WebKit/LayoutTests/fast/parser/invalid-xml-ver.html
[modify] https://crrev.com/fdf397d40c16b0bc3f926d06faa093439b5f8ae3/third_party/WebKit/Source/core/xml/parser/XMLDocumentParser.cpp

ClusterFuzz has detected this issue as fixed in range 439396:439418.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6229181176479744

Fuzzer: attekett_surku_fuzzer
Job Type: linux_debug_chrome
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  false. DOMExeption should not be thrown in XMLDocumentParser.cpp
  blink::NoExceptionStateAssertionChecker::throwDOMException
  blink::Document::setXMLVersion
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_debug_chrome&range=382949:383023
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_debug_chrome&range=439396:439418

Minimized Testcase (0.08 Kb):
Download: https://cluster-fuzz.appspot.com/download/AMIfv95Y56rnZqtmFwi5SGVSZTq4Vm4yptMaMIENoVRxSIPPvA6TWEZFpilyuVKY-aP4SZ-V_Muei5wh6q7q2qlo-RE4rNLzeZTiGAtKZwT09_6tdaFcWjjRaflR7wiEq-sua-MaTYIs0k-mKq2wPVKIl7tuPnQEhQ?testcase_id=6229181176479744
��<?xml version="1.1" encoding="UTF-16"?>



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