Revert "Clarify SiteIsolationPolicyBrowserTest"

This reverts commit e1a4f9c770aa456824b43ac096b6779025a3ec02.

Reason for revert: Modified test failing on android-desktop-x64-rel-15-tests. Example failure: https://ci.chromium.org/ui/p/chromium/builders/ci/android-desktop-x64-rel-15-tests/3091/overview

Original change's description:
> Clarify SiteIsolationPolicyBrowserTest
>
> This CL makes the SiteIsolationPolicyBrowserTest.NoPolicyNoTrialsFlags
> test more specific on Android.
>
> BUG=395862563
>
> Change-Id: Iaf05b612ea8a50dae0f73e63960d4378644a5103
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6417023
> Reviewed-by: Anqing Zhao <anqing@chromium.org>
> Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1440588}

Bug: 395862563
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I15af994f6d6bf9a222dd8cfa6c24036094167ab4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6418606
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Yue Zhang <yuezhanggg@chromium.org>
Auto-Submit: Yue Zhang <yuezhanggg@chromium.org>
Owners-Override: Yue Zhang <yuezhanggg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1440626}