Supporting command line argument to force field trials

chrome/browser/prerender/prerender_field_trial.cc

Index: chrome/browser/prerender/prerender_field_trial.cc
diff --git a/chrome/browser/prerender/prerender_field_trial.cc b/chrome/browser/prerender/prerender_field_trial.cc
index 51cfd93645bcf7ad4262cb7de59f9613a114e02b..38ada47ec973e217ad1331463f78613babba8594 100644
--- a/chrome/browser/prerender/prerender_field_trial.cc
+++ b/chrome/browser/prerender/prerender_field_trial.cc
@@ -31,9 +31,8 @@ void SetupPrefetchFieldTrial() {
 
   const base::FieldTrial::Probability divisor = 1000;
   const base::FieldTrial::Probability prefetch_probability = 500;
-  scoped_refptr<base::FieldTrial> trial(
-      new base::FieldTrial("Prefetch", divisor,
-                           "ContentPrefetchPrefetchOff", 2012, 6, 30));
+  scoped_refptr<base::FieldTrial> trial(base::FieldTrial::CreateInstance(
+      "Prefetch", divisor, "ContentPrefetchPrefetchOff", 2012, 6, 30));
   const int kPrefetchOnGroup = trial->AppendGroup("ContentPrefetchPrefetchOn",
                                                   prefetch_probability);
   PrerenderManager::SetIsPrefetchEnabled(trial->group() == kPrefetchOnGroup);
@@ -68,9 +67,8 @@ void SetupPrerenderFieldTrial() {
            control1_probability + no_use1_probability + exp2_probability +
            exp2_5min_ttl_probability + control2_probability +
            no_use2_probability);
-  scoped_refptr<base::FieldTrial> trial(
-      new base::FieldTrial("Prerender", divisor,
-                           "ContentPrefetchPrerender1", 2012, 6, 30));
+  scoped_refptr<base::FieldTrial> trial(base::FieldTrial::CreateInstance(
+      "Prerender", divisor, "ContentPrefetchPrerender1", 2012, 6, 30));
 
   const int kExperiment1Group = trial->kDefaultGroupNumber;
   const int kExperiment15minTTLGroup =
@@ -192,8 +190,8 @@ void ConfigureOmniboxPrerender() {
     kDisabledProbability = 1;
   }
   scoped_refptr<base::FieldTrial> omnibox_prerender_trial(
-      new base::FieldTrial(kOmniboxTrialName, kDivisor,
-                           "OmniboxPrerenderEnabled", 2012, 8, 30));
+      base::FieldTrial::CreateInstance(
+          kOmniboxTrialName, kDivisor, "OmniboxPrerenderEnabled", 2012, 8, 30));
   omnibox_prerender_trial->AppendGroup("OmniboxPrerenderDisabled",
                                        kDisabledProbability);
 
@@ -202,8 +200,9 @@ void ConfigureOmniboxPrerender() {
   const base::FieldTrial::Probability kEightProbability = 33;
 
   scoped_refptr<base::FieldTrial> weighting_trial(
-      new base::FieldTrial("OmniboxPrerenderHitWeightingTrial", kDivisor,
-                           "OmniboxPrerenderWeight1.0", 2012, 8, 30));
+      base::FieldTrial::CreateInstance("OmniboxPrerenderHitWeightingTrial",
+                                       kDivisor, "OmniboxPrerenderWeight1.0",
+                                       2012, 8, 30));
   const int kOmniboxWeightFourGroup =
       weighting_trial->AppendGroup("OmniboxPrerenderWeight4.0",
                                    kFourProbability);