Supporting command line argument to force field trials

chrome/browser/net/network_stats.cc

 // 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.
 
 #include "chrome/browser/net/network_stats.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/metrics/field_trial.h"
@@ skipping 635 matching lines @@
       probability_per_group = kDivisor;
     else if (channel == chrome::VersionInfo::CHANNEL_DEV)
       // Enable the connectivity testing for 10% of the users in dev channel.
       probability_per_group = 100;
     else if (channel == chrome::VersionInfo::CHANNEL_BETA)
       // Enable the connectivity testing for 5% of the users in beta channel.
       probability_per_group = 50;
 
     // After October 30, 2012 builds, it will always be in default group
     // (disable_network_stats).
-    trial = new base::FieldTrial("NetworkConnectivity", kDivisor,
-                                 "disable_network_stats", 2012, 10, 30);
+    trial = base::FieldTrialList::GetFieldTrialInstance(
+        "NetworkConnectivity", kDivisor, "disable_network_stats", NULL,
+        2012, 10, 30);
 
     // Add option to collect_stats for NetworkConnectivity.
     int collect_stats_group = trial->AppendGroup("collect_stats",
                                                  probability_per_group);
     if (trial->group() == collect_stats_group)
       collect_stats = true;
 
     if (collect_stats) {
       // Pick a port randomly from the set of TCP/UDP echo server ports
       // specified in |kPorts|.
@@ skipping 39 matching lines @@
       host_resolver, tcp_server_address, histogram_port,
       kSmallTestBytesToSend, net::CompletionCallback());
 
   TCPStatsClient* large_tcp_client = new TCPStatsClient();
   large_tcp_client->Start(
       host_resolver, tcp_server_address, histogram_port,
       kLargeTestBytesToSend, net::CompletionCallback());
 }
 
 }  // namespace chrome_browser_net