Shields breaking fonts on Feedly

[pilgrim-brave]

spun off from #23093 (comment) because this bug has a separate root cause and was not fixed when other sites mentioned in that issue were fixed

[stephendonner]

Testplan:

1. install latest Brave
2. launch Brave
3. load feedly.com
4. click on the Login button
5. look at the text, comparing to below:

actual	expected

[kjozwiak]

Removing the OS/Android label as it looks like Android wasn't affected, specifically the STR/Case @stephendonner mentioned above. Example using 1.39.120 Chromium: 102.0.5005.99 which doesn't include the fix from brave/brave-core#13807 but has Font FP which was introduced in 1.39.x:

Shields Enabled with default FP	Shields Disabled

Doesn't seem to affect Linux either. Used 1.39.122 Chromium: 102.0.5005.115 which doesn't have the above fix but looks like everything is working as expected. Example:

Shields Enabled with default FP	Shields Disabled

[kjozwiak]

Looks like this might have regressed Win as it was working using 1.39.122 Chromium: 102.0.5005.115 but now seems to have regressed while using 1.42.2 Chromium: 103.0.5060.53. Example:

Using 1.39.122 Chromium: 102.0.5005.115

Shields Enabled (FP using default)	Shields Disabled

Using 1.42.2 Chromium: 103.0.5060.53

Shields Enabled (FP using default)	Shields Disabled

[kjozwiak]

@brave/qa-team Win case will be handled via #23541. The above requires 1.40.104 or higher for 1.40.x verification 👍

[stephendonner]

Verified PASSED using

Brave	1.40.104 Chromium: 103.0.5060.53 (Official Build) (x86_64)
Revision	a1711811edd74ff1cf2150f36ffa3b0dae40b17f-refs/branch-heads/5060@{#853}
OS	macOS Version 11.6.7 (Build 20G630)

Tested several times (with and without app restarts), with both new and pre-existing profiles.

Couldn't get it to fail 👍

run 1	run 5	run 8	run 17