Chrome Version : 72.0.3626.0 (Official Build) edf89be4ed3da140d2558a9a575ca0e6da65e5de-refs/branch-heads/3626@{#1} 64 bit
OS : Mac(10.13.6, 10.13.1, 10.14.2)

Test URL : https://msu.edu/~urban/sme865/resources/embedded_pdf.html

What steps will reproduce the problem?
1. Launch chrome, navigate to above test URL and scroll down the page.
2. In PDF, right click on “urban@msu.edu” link and open it in new tab. (New blank tab opens)
3. In newly opened tab, right click and open ‘Cast’ overlay.
4. Now, switch to adjacent PDF tab and observe the favicon icon of a “Untitled” tab. 

Actual Result : Default favicon icon is not seen for “Untitled” tab when another tab is active.

Expected Result : “Untitled” tab should have a default favicon icon even when another tab is active.

This is a regression issue broken in M-70 and below is the bisect information:
Good Build : 70.0.3503.0 (Revision : 578160)
Bad Build : 70.0.3504.0 (Revision : 578510)

Change-Log URL:
https://chromium.googlesource.com/chromium/src/+log/bcb7db78edc13f57577f0a9562c98918bdcc10ae..67d21d10815fe6d87d1785a65a50fbc386e6605b

Suspect: https://chromium.googlesource.com/chromium/src/+/67d21d10815fe6d87d1785a65a50fbc386e6605b

@ellyjones: Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Note:
1. This is Mac OS specific issue.
2. Issue is reproducible in Stable #70.0.3538.110 and Dev #72.0.3622.0

Thank you..!
 

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