Revert "[URL] Preserve Blink's CSP behavior for non-special URLs"

This reverts commit 5de3a8d8986b27ec4278e4e6c949f909c8b2ae9b.

Reason for revert: Possible culprit on https://crbug.com/342443922 (P0 issue).


Original change's description:
> [URL] Preserve Blink's CSP behavior for non-special URLs
>
> This CL is similar to https://crrev.com/c/5528336, but for Blink's
> CSP implementation to ensure the behavior remains consistent
> regardless of non-special URL support.
>
> The following tests now pass:
>
> - CSPSourceTest.MatchingAsSelf
> - CSPSourceTest.SchemeIsEmpty
>
> Bug: 40063064
> Change-Id: I80d7e64a627ffc9dbb7616027467ea1c6616b983
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5561804
> Reviewed-by: Antonio Sartori <antoniosartori@chromium.org>
> Commit-Queue: Hayato Ito <hayato@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1304889}

Bug: 40063064
Change-Id: I08672b26fd6f963db855024a07892b06339ef87e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5564286
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1305479}