Add a new GetInstance() method for singleton classes under chrome/service and /net.

net/net.gyp

 # Copyright (c) 2010 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 11 matching lines @@
         'ssl_false_start_blacklist_process#host',
       ],
       'sources': [
         'base/address_family.h',
         'base/address_list.cc',
         'base/address_list.h',
         'base/address_list_net_log_param.cc',
         'base/address_list_net_log_param.h',
         'base/auth.cc',
         'base/auth.h',
+        'base/bandwidth_metrics.cc',
+        'base/bandwidth_metrics.h',
         'base/cache_type.h',
         'base/capturing_net_log.cc',
         'base/capturing_net_log.h',
         'base/cert_database.cc',
         'base/cert_database.h',
         'base/cert_database_mac.cc',
         'base/cert_database_nss.cc',
         'base/cert_database_openssl.cc',
         'base/cert_database_win.cc',
         'base/cert_status_flags.cc',
@@ skipping 1405 matching lines @@
       ],
     }],
   ],
 }
 
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