Update NetLog to be thread safe.

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 58 matching lines @@
         'base/dnsrr_resolver.h',
         'base/escape.cc',
         'base/escape.h',
         'base/ev_root_ca_metadata.cc',
         'base/ev_root_ca_metadata.h',
         'base/file_stream.h',
         'base/file_stream_posix.cc',
         'base/file_stream_win.cc',
         'base/filter.cc',
         'base/filter.h',
-        'base/forwarding_net_log.cc',
-        'base/forwarding_net_log.h',
         'base/gzip_filter.cc',
         'base/gzip_filter.h',
         'base/gzip_header.cc',
         'base/gzip_header.h',
         'base/host_cache.cc',
         'base/host_cache.h',
         'base/host_mapping_rules.cc',
         'base/host_mapping_rules.h',
         'base/host_port_pair.cc',
         'base/host_port_pair.h',
@@ skipping 733 matching lines @@
         'base/cookie_monster_unittest.cc',
         'base/data_url_unittest.cc',
         'base/directory_lister_unittest.cc',
         'base/dnssec_unittest.cc',
         'base/dns_util_unittest.cc',
         'base/dnsrr_resolver_unittest.cc',
         'base/escape_unittest.cc',
         'base/file_stream_unittest.cc',
         'base/filter_unittest.cc',
         'base/filter_unittest.h',
-        'base/forwarding_net_log_unittest.cc',
         'base/gzip_filter_unittest.cc',
         'base/host_cache_unittest.cc',
         'base/host_mapping_rules_unittest.cc',
         'base/host_resolver_impl_unittest.cc',
         'base/keygen_handler_unittest.cc',
         'base/leak_annotations.h',
         'base/listen_socket_unittest.cc',
         'base/listen_socket_unittest.h',
         'base/mapped_host_resolver_unittest.cc',
         'base/mime_sniffer_unittest.cc',
@@ skipping 561 matching lines @@
       ],
     }],
   ],
 }
 
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