[M125] Disable KeyboardFocusableScrollers from stable

This is causing some elements to get incorrectly recognized as
focusable. Rolling back the release until we fix the bug.

(cherry picked from commit 54ed36f40085a38577bf76993aa21131f0bb2d9f)

Change-Id: I3b363bcf16a3c883d4cec68d7162e7d290477e73
Bug: 336490037, 40113891
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5484749
Reviewed-by: Mason Freed <masonf@chromium.org>
Commit-Queue: Di Zhang <dizhangg@chromium.org>
Commit-Queue: Mason Freed <masonf@chromium.org>
Auto-Submit: Di Zhang <dizhangg@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1292118}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5490644
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/6422@{#521}
Cr-Branched-From: 9012208d0ce02e0cf0adb9b62558627c356f3278-refs/heads/main@{#1287751}
diff --git a/third_party/blink/renderer/platform/runtime_enabled_features.json5 b/third_party/blink/renderer/platform/runtime_enabled_features.json5
index 475fdfb..412a7de 100644
--- a/third_party/blink/renderer/platform/runtime_enabled_features.json5
+++ b/third_party/blink/renderer/platform/runtime_enabled_features.json5
@@ -2196,9 +2196,8 @@
     {
       // TODO(crbug.com/40113891): This feature allow scrollers to be
       // keyboard focusable by default.
-      // This should be removed in M128 (Jun 24, 2024) assuming no issues.
       name: "KeyboardFocusableScrollers",
-      status: "stable",
+      status: "experimental",
     },
     {
       // This feature makes HTMLLabelElement::DefaultEventHandler always call