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 532 matching lines @@
 
     // Enable the connectivity testing for 0.5% of the users.
     base::FieldTrial::Probability probability_per_group = 5;
 
     chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
     if (channel == chrome::VersionInfo::CHANNEL_CANARY)
       probability_per_group = kDivisor;
 
     // 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::FieldTrial::CreateInstance(
+        "NetworkConnectivity", kDivisor, "disable_network_stats", 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)
     return;
@@ skipping 33 matching lines @@
       host_resolver, tcp_server_address, kSmallTestBytesToSend,
       net::CompletionCallback());
 
   TCPStatsClient* large_tcp_client = new TCPStatsClient();
   large_tcp_client->Start(
       host_resolver, tcp_server_address, kLargeTestBytesToSend,
       net::CompletionCallback());
 }
 
 }  // namespace chrome_browser_net