Supporting command line argument to force field trials

chrome_frame/chrome_frame_automation.cc

Index: chrome_frame/chrome_frame_automation.cc
diff --git a/chrome_frame/chrome_frame_automation.cc b/chrome_frame/chrome_frame_automation.cc
index 88f5f9c5a6677559e3c0f99378d5d72241509182..9a649c0f7943ffa3d275491c0e8a7ab93734a54f 100644
--- a/chrome_frame/chrome_frame_automation.cc
+++ b/chrome_frame/chrome_frame_automation.cc
@@ -1040,8 +1040,10 @@ void ChromeFrameAutomationClient::InitializeFieldTrials() {
   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::FieldTrialList::FactoryGetFieldTrial(
+            "ChromeShutdownDelay", 1000, kWithDelayFieldTrialName,
+            2013, 3, 7, NULL);
 
     // Be consistent for this client. Note that this will only have an effect
     // once the client id is persisted. See http://crbug.com/117188