Revert "Fix CSSPreloadScanner to avoid missing rules"

This reverts commit 6eb116c494d620ced1f82156eddf91aeca6bba7d.

Reason for revert: The CL added files to non-existent WebKit/LayoutTests/.

Original change's description:
> Fix CSSPreloadScanner to avoid missing rules
> 
> This fixes a couple of bugs with the CSSPReloadScanner that made it miss
> rules in which the URL wasn't quoted or the rule didn't end with a
> semicolon. It also adds tentative WPT tests for that functionality, as
> the tests are also relevant for WebKit.
> 
> Bug: 903785
> Change-Id: I6d7dae1db3617184148fd71dfdb62fa1ee19e74f
> Reviewed-on: https://chromium-review.googlesource.com/c/1331042
> Commit-Queue: Yoav Weiss <yoavweiss@chromium.org>
> Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#610744}

TBR=kouhei@chromium.org,csharrison@chromium.org,yoavweiss@chromium.org

Change-Id: Ib2dcae03345d0f05f970b226a727f28e11a6c866
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 903785
Reviewed-on: https://chromium-review.googlesource.com/c/1350014
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610749}
7 files changed