Supporting command line argument to force field trials

chrome/browser/net/http_pipelining_compatibility_client.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/http_pipelining_compatibility_client.h"
 
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
 #include "base/string_split.h"
@@ skipping 288 matching lines @@
 
   const base::FieldTrial::Probability kDivisor = 100;
   base::FieldTrial::Probability probability_to_run_test = 0;
 
   const char* kTrialName = "HttpPipeliningCompatibility";
   base::FieldTrial* trial = base::FieldTrialList::Find(kTrialName);
   if (trial) {
     return;
   }
   // After April 1, 2012, the trial will disable itself.
-  trial = new base::FieldTrial(kTrialName, kDivisor,
-                               "disable_test", 2012, 4, 1);
+  trial = base::FieldTrialList::GetFieldTrialInstance(
+      kTrialName, kDivisor, "disable_test", NULL, 2012, 4, 1);
 
   chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
   if (channel == chrome::VersionInfo::CHANNEL_CANARY) {
     probability_to_run_test = 20;
   }
 
   int collect_stats_group = trial->AppendGroup("enable_test",
                                                probability_to_run_test);
   if (trial->group() != collect_stats_group) {
     return;
@@ skipping 44 matching lines @@
   content::BrowserThread::PostTask(
       content::BrowserThread::IO,
       FROM_HERE,
       base::Bind(&CollectPipeliningCapabilityStatsOnIOThread,
                  pipeline_test_server,
                  make_scoped_refptr(
                      io_thread->system_url_request_context_getter())));
 }
 
 }  // namespace chrome_browser_net