Revert "[CR2023] Fix Textfield hover when selected."

This reverts commit 83eea99f.

Reason for revert: Crash detected. https://bugs.chromium.org/p/chromium/issues/detail?id=1458522#c4

Original change's description:
> [CR2023] Fix Textfield hover when selected.
>
> After pressing on a Textfield, the background hover should disappear. Since Inkdrop doesn't support this, delegate to the Textfield's `OnMousePressed` to set the Inkdrop's hover state.
>
> Bug: 1400023
> Change-Id: Ifab313d2f23c9ba8ff9acccf98b8837d7bf4cc7b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4642260


> Commit-Queue: David Yeung <dayeung@chromium.org>
> Reviewed-by: Elaine Chien <elainechien@chromium.org>
> Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/main@{#1162685}

Bug: 1400023
Change-Id: I750cc45b6a21f5023d7002cf8116f5aa68e133ef
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4651397


Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Prudhvikumar Bommana <pbommana@google.com>
Reviewed-by: David Yeung <dayeung@chromium.org>
Commit-Queue: David Yeung <dayeung@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1163178}