[NTP] Replace old team in NTP WATCHLISTS

Change-Id: I136a03e7b2174a3a4bc1ffccfb4c96a63e6e5fc0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919522Reviewed-by: Dan Beam <dbeam@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715970}

WATCHLISTS

@@ -2412,10 +2412,7 @@
                         'raphael.kubo.da.costa@intel.com'],
     'installer_win': ['grt+watch@chromium.org',
                       'wfh+watch@chromium.org'],
-    'instant': ['gayane+watch@chromium.org',
-                'kristipark+watch@chromium.org',
-                'kmilka+watch@chromium.org',
-                'ramyan+watch@chromium.org'],
+    'instant': ['dbeam+watch-ntp@chromium.org'],
     'ios': ['ios-reviews@chromium.org'],
     'ios_chrome': ['ios-reviews+chrome@chromium.org',
                    'marq+watch@chromium.org'],