[ios] Add flag ownership for olivierrobin

iOS flag owners were asked to claim ownership and state an expiry in
this announcement email:
https://groups.google.com/a/google.com/g/bling-team/c/7YC_3l6yEzo/m/1-iZg1fPAAAJ

This is one of several CLs that adds iOS flag ownership information into
flag-metadata.json.

The owner of these flags was identified via git blame. A placeholder
expiry milestone of M86 was added. Please either LGTM, or suggest a new
owner and/or expiry.

Bug: 1058614
Change-Id: I4f527871f7b54804bf43a15e9c39419f0b272047
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094243Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749209}

chrome/browser/flag-metadata.json

@@ -283,6 +283,11 @@
     "owners": [ "rogerm" ],
     "expiry_milestone": 73
   },
+  {
+    "name": "autofill-ios-delay-between-fields",
+    "owners": [ "olivierrobin" ],
+    "expiry_milestone": 86
+  },
   {
     "name": "autofill-keyboard-accessory-view",
     "owners": [ "fhorschig@chromium.org" ],
@@ -343,6 +348,11 @@
     "owners": [ "sczs" ],
     "expiry_milestone": 84
   },
+  {
+    "name": "autofill-show-all-profiles-on-prefilled-forms",
+    "owners": [ "olivierrobin" ],
+    "expiry_milestone": 86
+  },
   {
     "name": "autofill-use-improved-label-disambiguation",
     "owners": [ "fhorschig" ],