Version: 54.0.2817.0
OS: Ubuntu 14.04, Windows

What steps will reproduce the problem?
(1)Launch Chrome and go to chrome://chrome-signin page.
(2)Click F12 to open Dev tools and click on Toogle device toolbar.
(3)Click on reload button and observe. Page is not loading and showing the error "Plug-in blocked".(Refer actual and expected videos).

Expected: Chrome Signin page should reload in Emulation mode.
Actual: Instead, Chrome Signin page is not getting reloaded.

This is a regression issue broken in M-49.

Manual good and Bad Builds:
Good Build: 49.0.2566.0
Bad Build:  49.0.2567.0

Below is the Manual Bisect Info:
CHANGELOG URL: https://chromium.googlesource.com/chromium/src/+log/49.0.2566.0..49.0.2567.0?pretty=fuller&n=10000

Change log from Windows: http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog.html?url=/trunk/src&range=360161%3A360171

Unable to find the Suspect from the above Change log. Someone from Dev team please look into the issue


 

Deleted: actual_signin_screen.ogv 833 KB

	actual_signin_screen.ogv 833 KB View Download

Deleted: Expected_signin_screen.ogv 1.7 MB

	Expected_signin_screen.ogv 1.7 MB View Download