[Clean-up] Remove NetworkStats code, which has been dead code since July 2014.

chrome/chrome_tests_unit.gypi

 # Copyright 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_unit_tests_sources': [
       '../components/autofill/content/renderer/test_password_autofill_agent.cc',
       '../components/autofill/content/renderer/test_password_autofill_agent.h',
       '../components/autofill/content/renderer/test_password_generation_agent.cc',
       '../components/autofill/content/renderer/test_password_generation_agent.h',
@@ skipping 138 matching lines @@
       'browser/metrics/variations/variations_service_unittest.cc',
       'browser/net/certificate_error_reporter_unittest.cc',
       'browser/net/chrome_fraudulent_certificate_reporter_unittest.cc',
       'browser/net/chrome_network_delegate_unittest.cc',
       'browser/net/connection_tester_unittest.cc',
       'browser/net/dns_probe_runner_unittest.cc',
       'browser/net/dns_probe_service_unittest.cc',
       'browser/net/evicted_domain_cookie_counter_unittest.cc',
       'browser/net/net_error_tab_helper_unittest.cc',
       'browser/net/net_log_temp_file_unittest.cc',
-      'browser/net/network_stats_unittest.cc',
       'browser/net/predictor_unittest.cc',
       'browser/net/pref_proxy_config_tracker_impl_unittest.cc',
       'browser/net/probe_message_unittest.cc',
       'browser/net/quota_policy_channel_id_store_unittest.cc',
       'browser/net/safe_search_util_unittest.cc',
       'browser/net/spdyproxy/data_reduction_proxy_chrome_settings_unittest.cc',
       'browser/net/spdyproxy/data_reduction_proxy_settings_unittest_android.cc',
       'browser/net/ssl_config_service_manager_pref_unittest.cc',
       'browser/net/url_info_unittest.cc',
       'browser/password_manager/chrome_password_manager_client_unittest.cc',
@@ skipping 2612 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }