Cherry-picking hangouts.google.com whitelisting change into M51

chrome/chrome_renderer.gypi

 # 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.
 
 {
   'variables': {
     'chrome_renderer_sources': [
+      'renderer/app_categorizer.h',
+      'renderer/app_categorizer.cc',
       'renderer/banners/app_banner_client.cc',
       'renderer/banners/app_banner_client.h',
       'renderer/benchmarking_extension.cc',
       'renderer/benchmarking_extension.h',
       'renderer/chrome_content_renderer_client.cc',
       'renderer/chrome_content_renderer_client.h',
       'renderer/chrome_render_frame_observer.cc',
       'renderer/chrome_render_frame_observer.h',
       'renderer/chrome_render_process_observer.cc',
       'renderer/chrome_render_process_observer.h',
@@ skipping 373 matching lines @@
             '../components/components.gyp:dom_distiller_core',  # Needed by chrome_content_renderer_client.cc.
           ],
           'include_dirs': [
             '<(DEPTH)/third_party/wtl/include',
           ],
         }],
       ],
     },
   ],
 }