Remove an obsolete WATCHLISTS entry

Change-Id: I18e768c84442c5c0d473dd8af2bbe672f26512d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974475
Auto-Submit: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726073}

WATCHLISTS

@@ -2512,8 +2512,7 @@
     'message_loop': ['sadrul@chromium.org'],
     'metrics': ['asvitkine+watch@chromium.org'],
     'metrics_perf': ['cwp-reviews+chromium@google.com'],
-    'metrics_xml_files': ['asvitkine+watchxml@chromium.org',
-                          'ltina+watch@google.com'],
+    'metrics_xml_files': ['asvitkine+watchxml@chromium.org'],
     'midi': ['toyoshim+midi@chromium.org'],
     'mojo': ['darin+watch@chromium.org'],
     'multidevice': ['hansberry+watch-multidevice@chromium.org',