fix: make getUserMedia APIs work again on C72+

[brenca]

Description of Change

Fixes #16508
Fixes #16513

Pretty much what the title says, got the fix from https://bitbucket.org/chromiumembedded/cef/commits/e94b3e2478491e5867e970687afcd53323a6fbe8

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• PR title follows semantic commit guidelines
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes:

Fixed getUserMedia on v5.0.x and up.

[MarshallOfSound]

@brenca Not required for this PR but do you know if it's possible to write a test to check that the API isn't Completely Broken during an upgrade. E.g. expect(mediaStream).to.not.be.a.black.square.of.nothing()?

[deepak1556]

Upstream fix: https://chromium-review.googlesource.com/c/chromium/src/+/1049931/

Not sure why this wasn't part of //content client, could have benefitted all embedders.

Fixes #16508
Fixes #16513

[deepak1556]

LGTM, thanks!

[deepak1556]

Might need dependency on //services/video_capture/public/mojom:constants.

[release-clerk]

Release Notes Persisted

[trop]

I have automatically backported this PR to "5-0-x", please check out #16768