Revert "[ct] task-queue-sk_test.js: Fix assertion."
Revert "[ct] task-queue-sk_test.js: Fix assertion."

This reverts commit b5d7e166204e515caccf716ee47a4ceffee99f37.

Reason for revert: chai-dom support was introduced in https://skia-review.googlesource.com/c/buildbot/+/293236.

Original change's description:
> [ct] task-queue-sk_test.js: Fix assertion.
> 
> This fixes the following error:
> 
>   Error: Invalid Chai property: class. Did you mean "has"?
> 
> Somehow the "expect(...).to.have.class('foo')" syntax stopped working after moving to the TypeScript-enabled Webpack configuration. Probably some kind of issue with the npm dependencies.
> 
> Two possible fixes:
> 
> 1. Rewrite test to make an assertion directly against the element's className property.
> 2. Explicitly add support for the "to.have.class" syntax via chai-dom[1] and karma-chai-dom[2].
> 
> I chose to go with option 1 because it's the simplest and because AFAIK there's no other test in the repo that uses this syntax, but we can always switch to option 2 if anyone is interested.
> 
> [1] https://github.com/nathanboktae/chai-dom.
> [2] https://github.com/nathanboktae/karma-chai-dom.
> 
> Bug: skia:10292
> Change-Id: I8fcfaa9c2d3373558b3f97b2848f0950794f17eb
> Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/292735
> Reviewed-by: Weston Tracey <westont@google.com>
> Commit-Queue: Leandro Lovisolo <f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com>

TBR=rmistry@google.com,f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com,westont@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: skia:10292
Change-Id: I048cf47aff595d66dc00b869a1067559a53db8bb
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/293616
Reviewed-by: Leandro Lovisolo <f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com>
Commit-Queue: Leandro Lovisolo <f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com>
Auto-Submit: Leandro Lovisolo <f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com>

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