Extend the safety check Chrome cleaner child flag to M92

Bug: 1087263
Change-Id: I939c65d12c4f1ecbc840d0f6fe9d13fae3f861ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526446Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Rainhard Findling <rainhard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825401}

chrome/browser/flag-metadata.json

@@ -4082,7 +4082,7 @@
       "msramek",
       "chrome-friendly-settings@google.com"
     ],
-    "expiry_milestone": 88
+    "expiry_milestone": 92
   },
   {
     "name": "safety-check-ios",