Replace ===/!== in assert_true/false

[gsnedders]

This is relatively common and this does some of the simple cases that I can easily replace with regex.

[reillyeon]

This change is too large. I have no idea what part of it @wpt-pr-bot wants me to look at.

[stephenmcgruer]

This change is too large. I have no idea what part of it @wpt-pr-bot wants me to look at.

wpt-pr-bot uses 'reviewers' as a cc list (because GitHub has basically no support for cc... there is a very stalled RFC to change how wpt-pr-bot works here), so you are not necessarily expected to review this. GitHub uses 'assignees' for what Chromium calls 'reviewers'.

That said, it looks like you are listed as an owner for 5 directories:

$ grep -r reillyeon `find . -name META.yml`
./bluetooth/META.yml:  - reillyeon
./webusb/META.yml:  - reillyeon
./mediacapture-image/META.yml:  - reillyeon
./orientation-event/META.yml:  - reillyeon
./screen-wake-lock/META.yml:  - reillyeon

So for this PR, mediacapture-image/getPhotoCapabilities.html seems to be the only file that you might want to look at.

(I do not disagree that this is a large and wide PR, and wpt-pr-bot does a bad job for large, wide PRs.)

---

Overall, for this PR I am most interested in whether @jan-ivar is happy with the new version (and thanks to @gsnedders for taking on this refactor!)

[stephenmcgruer]

LGTM again. I understand there is some risk of changed semantics here, but with the removal of most of the controversial cases I think this is a net positive change for the test suite.

I took a look at the Chrome, Firefox, and Safari results. Chrome and Firefox had no different results before/after at all. Safari had a few:

css/css-fonts/variations/at-font-face-font-matching.html - results change seems suspicious at first glance, but looking at wpt.fyi these tests are pretty flaky on Safari and I accept that this is likely flake rather than a behavioral change.

resource-timing/resource_dedicated_worker.html - flaky on Safari

user-timing/measure_associated_with_navigation_timing.html - flaky on Safari

Please give 24 hours for someone to raise a new objection, otherwise LGTM to merge.