Added tracing+reviews@chromium.org to tracing watch

WATCHLISTS

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Watchlist Rules
 # Refer: http://dev.chromium.org/developers/contributing-code/watchlists
 
 # IMPORTANT: The regular expression filepath is tested against each path using
 # re.search, so it is not usually necessary to add .*.
 
@@ skipping 1023 matching lines @@
     'textinput': ['penghuang+watch@chromium.org',
                   'suzhe@chromium.org',
                   'yusukes+watch@chromium.org',
                   'nona+watch@chromium.org',
                   'yukishiino+watch@chromium.org'],
     'textinput_chromeos': ['yusukes+watch@chromium.org',
                            'nona+watch@chromium.org',
                            'yukishiino+watch@chromium.org'],
     'timers': ['chirantan+watch@chromium.org'],
     'tools_emacs': ['dhollowa+watch@chromium.org'],
-    'tracing': ['dsinclair+watch@chromium.org', 'wfh+watch@chromium.org'],
+    'tracing': ['tracing+reviews@chromium.org', 'wfh+watch@chromium.org'],
     'ui_compositor': ['cc-bugs@chromium.org'],
     'ui_resources': ['oshima+watch@chromium.org'],
     'valgrind': ['bruening+watch@chromium.org',
                  'glider+watch@chromium.org',
                  'timurrrr+watch@chromium.org'],
     'version_assembly': ['caitkp+watch@chromium.org',
                          'gab+watch@chromium.org'],
     'views': ['tfarina@chromium.org'],
     'views_core': ['tdanderson+views@chromium.org'],
     'virtual_keyboard': ['dfaden+virtualkb@google.com',
                          'groby+virtualkb@chromium.org'],
     'webkit': ['darin-cc@chromium.org'],
     'webrtc_media': ['wjia+watch@chromium.org',
                      'mcasas+watch@chromium.org',
                      'posciak+watch@chromium.org'],
     'website_settings': ['markusheintz@chromium.org'],
     'windows_sandboxing': ['wfh+watch@chromium.org'],
     'worker': ['jam@chromium.org'],
     'x11': ['derat+watch@chromium.org',
             'sadrul@chromium.org',
             'yusukes+watch@chromium.org'],
   },
 }