Simplify tests for utilities.js
Simplify tests for utilities.js

Bug: chromium:1032561
Change-Id: I8fb14d8d60b45fefc98ec62d00d8b17f20922361
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2002191
Reviewed-by: Paul Lewis <8915f5d5c39a08c5a3e8a8d7314756e4580816f9@chromium.org>
Commit-Queue: Mathias Bynens <17a2cbc4e33156874a9862b0f530521117e66a3d@chromium.org>

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