Add iclelland as a watcher of background sync code

Review URL: https://codereview.chromium.org/1612133003

Cr-Commit-Position: refs/heads/master@{#370801}
diff --git a/WATCHLISTS b/WATCHLISTS
index 9cb3b79..cd0355b 100644
--- a/WATCHLISTS
+++ b/WATCHLISTS
@@ -1259,7 +1259,8 @@
                  '[email protected]',
                  '[email protected]'],
     'automation': ['[email protected]'],
-    'background_sync': ['[email protected]','[email protected]'],
+    'background_sync': ['[email protected]','[email protected]',
+                        '[email protected]'],
     'base': ['[email protected]'],
     'base_allocator': ['[email protected]',
                        '[email protected]'],