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)Try accessing the links in emulation and observe.

Expected: We should be able to access the links in Emulation.
Actual: Instead, we can't access the links.

This is a regression issue broken in M-49.

Manual good and Bad Builds:
Good Build: 49.0.2587.0
Bad Build:  49.0.2592.5

Below is the Tool Bisect Info:
CHANGELOG URL:
https://chromium.googlesource.com/chromium/src/+log/f107bb8854c5f924ac99309e5fc102a002f264a9..bfec86b2a8d830ab069b9a0abf98f529aec29b7b

Suspecting https://codereview.chromium.org/1412923009

@wjmaclean : Please feel free to re-assign if this is not related to your change