Predator and CL did not find any possible suspects.
Using Code Search for the file, "render_widget_host_view_base.cc" assigning to the concern owner from Git Blame.
Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/11ed4bef9a8a74c8fb44a76d8a1c1326c885bb57

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

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e9fd8726d0409380965a4c6146aec023f05be2e8

commit e9fd8726d0409380965a4c6146aec023f05be2e8
Author: avi <avi@chromium.org>
Date: Mon Apr 10 16:17:58 2017

Ignore double-displays of the context menu.

BUG= 707534 
TEST=bug verified by clusterfuzz

Review-Url: https://codereview.chromium.org/2805393004
Cr-Commit-Position: refs/heads/master@{#463286}

[modify] https://crrev.com/e9fd8726d0409380965a4c6146aec023f05be2e8/content/browser/web_contents/web_contents_impl.cc

Clusterfuzz, please confirm.

ClusterFuzz has detected this issue as fixed in range 463085:463443.

Detailed report: https://clusterfuzz.com/testcase?key=5394869754527744

Fuzzer: mbarbella_js_mutation_layout
Job Type: linux_debug_chrome
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  showing_context_menu_ != showing in render_widget_host_view_base.cc
  content::RenderWidgetHostViewBase::SetShowingContextMenu
  RenderViewContextMenuBase::MenuWillShow
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_debug_chrome&range=415049:415582
Fixed: https://clusterfuzz.com/revisions?job=linux_debug_chrome&range=463085:463443

Reproducer Testcase: https://clusterfuzz.com/download/AMIfv97BEYj9JcykGu_freAIG84T3QcHvZaZXl6JfTsiCf63-x5qm3arW-zb7h21jUssm-s0uL7gd3PRxz0RInO3pHfxho7Y8miat3SS-x85SuaQfKuuxcwdYe64K23P1P4IZ7AOT4Vf5CofE_9ylhFJA0KwaevVAZYMhm10PPl0iaZ-YeR5nvp4oiZA6CS60SN8LPQzQQc0UV2alwMnPZ9iC1XPhNjjikYm-pq_ODtw2SBMd9X7ff3n8IuyumdiKsHdatS7UxNbGx0oVFVK-tY1L1dA_rVZsPtqe_lDeLo9gDtj-3eC_ns03VGe7dY0ZHLDzoPVCQbsVuvsntecqTK9HdyBTT5bgdxnR1SbA5pH0uM3bPg44DJvi2LiYrNVNePdkK2KMEguc-hu311n5QKBZuf6xXTJyA?testcase_id=5394869754527744


Additional requirements: Requires Gestures

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.