Extend flag "passwords-account-storage" in flag-metadata.json

While we're here, also remove "passwords-account-storage-saving-ui"
which doesn't exist anymore.

Bug: none
Change-Id: I9f202b7c39f8cfaa619ee65f72c11bff2f5e41a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276203
Auto-Submit: Marc Treib <treib@chromium.org>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784390}

chrome/browser/flag-metadata.json

@@ -3660,12 +3660,7 @@
   {
     "name": "passwords-account-storage",
     "owners": [ "mamir", "treib" ],
-    "expiry_milestone": 85
-  },
-  {
-    "name": "passwords-account-storage-saving-ui",
-    "owners": [ "mamir", "fhorschig" ],
-    "expiry_milestone": 85
+    "expiry_milestone": 89
   },
   {
     "name": "pdf-form-save",