Revert "Rewrite some aura touch selection browser tests."

This reverts commit 5177e73.

Reason for revert: Suspected to be causing failures of TouchSelectionControllerClientAuraCAPFeatureTest.SwipeToMoveCursorMagnifier on the CQ.

Sample failures:
https://ci.chromium.org/ui/p/chromium/builders/ci/Linux%20Tests/134124/overview
https://ci.chromium.org/ui/p/chromium/builders/ci/linux-bfcache-rel/50087/overview

Original change's description:
> Rewrite some aura touch selection browser tests.
>
> Try to better test end to end functionality and also clean things up a
> bit. Mainly:
>
> 1. Use ui::test::EventGenerator instead of directly creating the touch
>    and gesture events and calling rwhva->OnTouchEvent/OnGestureEvent.
>
> 2. Check selection bound values rather than just checking that they are
>    non-zero.
>
> 3. Split menu and magnifier test from the handle coordinates test.
>
> Bug: b:295261171
> Change-Id: Id02a40cdee53858910a5aad78fea0138e88c5e47
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4773898
> Reviewed-by: Robert Flack <flackr@chromium.org>
> Commit-Queue: Michelle Chen <michellegc@google.com>
> Reviewed-by: Ken Buchanan <kenrb@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1184654}

Bug: b:295261171
Change-Id: I4fde0964876750cd0ef738ba23e7eb33996a2c20
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4789459
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1184903}