Supporting command line argument to force field trials

chrome_frame/chrome_frame_automation.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_frame/chrome_frame_automation.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 1016 matching lines @@
               &ChromeFrameAutomationClient::ProcessUrlRequestMessage),
           base::Unretained(this), tab, msg, true));
   return true;
 }
 
 void ChromeFrameAutomationClient::InitializeFieldTrials() {
   static base::FieldTrial* trial = NULL;
   if (!trial) {
     // Do one-time initialization of the field trial here.
     // TODO(robertshield): End the field trial before March 7th 2013.
-    scoped_refptr<base::FieldTrial> new_trial = new base::FieldTrial(
-        "ChromeShutdownDelay", 1000, kWithDelayFieldTrialName, 2013, 3, 7);
+    scoped_refptr<base::FieldTrial> new_trial =
+        base::FieldTrial::CreateInstance("ChromeShutdownDelay", 1000,
+                                         kWithDelayFieldTrialName, 2013, 3, 7);
 
     // Be consistent for this client. Note that this will only have an effect
     // once the client id is persisted. See http://crbug.com/117188
     new_trial->UseOneTimeRandomization();
 
     new_trial->AppendGroup(kNoDelayFieldTrialName, 500);    // 50% without.
 
     trial = new_trial.get();
   }
 
@@ skipping 275 matching lines @@
     const net::URLRequestStatus& status) {
   automation_server_->Send(new AutomationMsg_RequestEnd(
       tab_->handle(), request_id, status));
 }
 
 void ChromeFrameAutomationClient::OnCookiesRetrieved(bool success,
     const GURL& url, const std::string& cookie_string, int cookie_id) {
   automation_server_->Send(new AutomationMsg_GetCookiesHostResponse(
       tab_->handle(), success, url, cookie_string, cookie_id));
 }