[UPM] Delay google-mobile-services-passwords flag expiration

The Unified Password Manager rollout on Android is ongoing, this flag
is in use. Added myself as owner as fhorschig@ is not focused on this
project.

google-mobile-services-passwords-error-messages flag expiration was
aligned with other UPM-related flags.

Bug: 1374786
Change-Id: I95abf5432ba22cab33d358eae336a168846282b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3959734
Auto-Submit: Maxim Anufriev <maxan@google.com>
Reviewed-by: Ioana Pandele <ioanap@chromium.org>
Commit-Queue: Maxim Anufriev <maxan@google.com>
Cr-Commit-Position: refs/heads/main@{#1059881}

chrome/browser/flag-metadata.json

@@ -3923,16 +3923,16 @@
   },
   {
     "name": "google-mobile-services-passwords",
-    "owners": [ "fhorschig@chromium.org", "vasilii" ],
-    "expiry_milestone": 108
+    "owners": [ "maxan@google.com", "vasilii" ],
+    "expiry_milestone": 112
   },
   {
     "name": "google-mobile-services-passwords-error-messages",
     "owners": [
       "ioanap",
       "izuzic@google.com"
     ],
-    "expiry_milestone": 110
+    "expiry_milestone": 112
   },
   {
     "name": "google-mobile-services-passwords-reenrollment",