[Passwords] Extend Password Check Flag to M87

Bug: 1049177
Change-Id: Ia233f566bbcda43944661cac8523f5ac4d27c9bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2178575
Auto-Submit: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#766484}

chrome/browser/flag-metadata.json

@@ -3376,7 +3376,7 @@
   {
     "name": "password-check",
     "owners": [ "jdoerrie", "vasilii" ],
-    "expiry_milestone": 84
+    "expiry_milestone": 87
   },
   {
     "name": "password-editing-android",