Add myself to the valgrind watch list.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/149337

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20175 0039d316-1c4b-4281-b951-d872f2087c98

WATCHLISTS

@@ -67,7 +67,7 @@
 
   'WATCHLISTS': {
     'this_file': ['nirnimesh@chromium.org'],
-    'valgrind': ['nirnimesh@chromium.org', 'dank@chromium.org', 'timurrrr@gmail.com'],
+    'valgrind': ['nirnimesh@chromium.org', 'dank@chromium.org', 'timurrrr@gmail.com', 'stuartmorgan@chromium.org'],
     'mac': ['jrg@chromium.org'],
     'base': ['brettw@chromium.org'],
     'views': ['ben@chromium.org'],