[M147 RC] Revert "[Editing] Respect autocorrect="off" for Windows touch keyboard"

This reverts commit d92a6c59e16e009d5a14f0be69cdb122df679fcf.

Reason for revert: CL seems to cause existing text to be
overwritten when typing IME text - see bug for details:
https://g-issues.chromium.org/u/0/issues/498745133?pli=1

Bug: 498745133

Original change's description:
> [Editing] Respect autocorrect="off" for Windows touch keyboard
>
> The HTML autocorrect attribute (part of the WHATWG HTML standard) lets
> web authors disable autocorrect on <input> and <textarea> elements by
> setting autocorrect="off". The Windows touch keyboard ignores this and
> still autocorrects words. For example, typing "truf" + space yields
> "true " instead of preserving "truf ".
>
> To reproduce:
>
> 1. On a Windows touch-enabled device, open a page with
> <input autocorrect="off">.
> 2. Tap the field to bring up the touch keyboard. 3. Type a misspelled
> word (e.g. "truf") then tap space. 4. Observe: the touch keyboard
> replaces "truf" with "true".
>
> TSF's InputScope has no autocorrect field, so the touch keyboard is
> unaware of the page's preference and always autocorrects.
>
> Fix: snapshot the document buffer in TSFTextStore::RequestLock() before
> granting the lock. After the lock, if autocorrect="off" and committed
> text was replaced (not appended) without an active IME composition,
> revert the buffer and skip the commit. Normal typing and IME composition
> are unaffected.
>
> Bug: 487613498
> Change-Id: Idcb07ce307a945d8f20250ca6c35d47e2bd8bbaf
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7609541
> Reviewed-by: Jesse McKenna <jessemckenna@google.com>
> Commit-Queue: Pranav Modi <pranavmodi@microsoft.com>
> Reviewed-by: Dana Fried <dfried@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1594544}

(cherry picked from commit 2f62cf50407c86cd1586be4b7e98cda2308b8bc0)

Bug: 487613498
Change-Id: Ia29ecb4dde8d4a58d14d1d5689cbaff202ac038c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7728166
Commit-Queue: Jesse McKenna <jessemckenna@google.com>
Reviewed-by: Dana Fried <dfried@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1609543}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7729438
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Srinivas Sista <srinivassista@chromium.org>
Commit-Queue: Srinivas Sista <srinivassista@chromium.org>
Cr-Commit-Position: refs/branch-heads/7727_49@{#5}
Cr-Branched-From: 7fdebb68aa7792503f4e14dc34645c014a0b0b23-refs/branch-heads/7727@{#2018}
Cr-Branched-From: ce01102937348db7b88c8a4257ee4b3ac702eb1a-refs/heads/main@{#1596535}