Chrome Version: <From about:version: Google Chrome 68.0.3440.118>
Chrome OS Version: <From about:version: Platform 10718.0.0.>
Chrome OS Platform: <Hana/Kevin>
<b>Network info: <network, encryption type, router model (if known)></b>

Please specify Cr-* of the system to which this bug/feature applies (add
the label below).

Steps To Reproduce:
(1) Click on the connected network and go to proxy settings
(2) Change it to the Manual proxy configuration.
(3) Turn off the "use the same proxy for all protocols" toggle.
(4) Fill in host and port details for Http proxy and click save

Expected Result:
The "use the same proxy for all protocols" should be off. 
Actual Result:
"use the same proxy for all protocols" toggles on

chrome://net-internals/#proxy - Shows correct results i.e. proxy settings only for HTTP protocol. 

Note: All other protocols should be left as default. If we change hostname or port number for other protocol, we do not see this issue. 
How frequently does this problem reproduce? (Always, sometimes, hard to
reproduce?)

What is the impact to the user, and is there a workaround? If so, what is
it?
Corner case but the user is not shown the correct configuration. 

Please provide any additional information below. Attach a screenshot or
log if possible.

For graphics-related bugs, please copy/paste the contents of the about gpu
page at the end of this report.
https://listnr.corp.google.com/report/85612469235

Will update, if similar issue is seen on M69 and M70