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Finishes transitioning layout and GPU tests from using "web_engine" to
using "web_engine_with_webui" instead, and strips unused resources from
"web_engine".

Bug: 1092729
Change-Id: Id6da0e6a051554ee330a219e15e4c9ae25775413
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485341
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819962}