Posting this issue since this was similar to "535031" which was Fixed and earlier.

@cbiesinger: Could you please have a look into this issue.

Thank you.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c37d7c08fe436fe0f53245eff661ada8c420a849

commit c37d7c08fe436fe0f53245eff661ada8c420a849
Author: eae <eae@chromium.org>
Date: Wed Jul 13 23:59:30 2016

Check for primaryFont in LayoutTextControl::getAvgCharWidth

Change LayoutTextControl::getAvgCharWidth to check if primaryFont is set
before attempting to access it falling back on measuring the width of 0.

BUG= 627818 
R=cbiesinger@chromium.org

Review-Url: https://codereview.chromium.org/2149683002
Cr-Commit-Position: refs/heads/master@{#405355}

[modify] https://crrev.com/c37d7c08fe436fe0f53245eff661ada8c420a849/third_party/WebKit/Source/core/layout/LayoutTextControl.cpp

ClusterFuzz has detected this issue as fixed in range 405185:405467.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=4984912272949248

Fuzzer: meacer_chromebot_extensions
Job Type: linux_asan_chrome_v8_arm
Platform Id: linux

Crash Type: UNKNOWN READ
Crash Address: 0x00000044
Crash State:
  blink::LayoutTextControl::getAvgCharWidth
  blink::LayoutTextControlMultiLine::getAvgCharWidth
  blink::LayoutTextControl::computeIntrinsicLogicalWidths
  
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_asan_chrome_v8_arm&range=405185:405467

Minimized Testcase (48.22 Kb): https://cluster-fuzz.appspot.com/download/AMIfv96GoFe31-h8E5yCd6XQxwyllAfSstaoVyIITiH2mJMM8kuiFoJOa-RQ8sCb8zvczNHiUAILWrW5V4DxyMzo1_TbAwZAL1m3a9xWAdNxFepxSG8B7AOt-ob-mbkvN1YFvb_rD9nPPGw2oEIpEwVwGfp2XwcxOjq89Yj94K1nnXuJgz001zY?testcase_id=4984912272949248

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