Revert "Enable surrounding text fix."

This reverts commit 1660d66.

Reason for revert: Looks causing crbug.com/1451324.

Original change's description:
> Enable surrounding text fix.
>
> BUG=1402906
> TEST=Tryjob
>
> Change-Id: Iaf76b8f2704d7d01ccf9e75c15f482a1893d89bb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4545822
> Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
> Reviewed-by: Darren Shen <shend@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1146277}

BUG=1402906, 1451324

(cherry picked from commit cd635b4)

Change-Id: I821e5a018cbe4759ee5da0414b46f809b92a5327
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4600182
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Curtis McMullan <curtismcmullan@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1155298}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4605559
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Srinivas Sista <srinivassista@chromium.org>
Owners-Override: Srinivas Sista <srinivassista@chromium.org>
Cr-Commit-Position: refs/branch-heads/5790@{#558}
Cr-Branched-From: 1d71a33-refs/heads/main@{#1148114}

ash/constants/ash_features.cc

@@ -826,7 +826,7 @@ BASE_FEATURE(kExoConsumedByImeByFlag,
 // or not (=decides using heuristics based on key code etc.).
 BASE_FEATURE(kExoSurroundingTextOffset,
              "ExoSurroundingTextOffset",
-             base::FEATURE_ENABLED_BY_DEFAULT);
+             base::FEATURE_DISABLED_BY_DEFAULT);
 
 // Allows RGB Keyboard to test new animations/patterns.
 BASE_FEATURE(kExperimentalRgbKeyboardPatterns,