Update IOS.URLMismatchInLegacyAndSlimNavigationManager owners

Change-Id: I799972ac69a4bc076741c32cc1a20414fee3c4a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2638552Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845227}

tools/metrics/ukm/ukm.xml

@@ -6489,8 +6489,8 @@ be describing additional metrics about the same event.
 </event>
 
 <event name="IOS.URLMismatchInLegacyAndSlimNavigationManager">
-  <owner>eugenebut@chromium.org</owner>
-  <owner>danyao@chromium.org</owner>
+  <owner>ajuma@chromium.org</owner>
+  <owner>gambard@chromium.org</owner>
   <summary>
     Logged when LegacyNavigationManager and KWKBasedNavigationManager have
     different last committed URLs. This means that either old or new navigation