Remove hit weight experiment

chrome/browser/prerender/prerender_field_trial.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/prerender/prerender_field_trial.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
@@ skipping 182 matching lines @@
   if (channel == chrome::VersionInfo::CHANNEL_STABLE ||
       channel == chrome::VersionInfo::CHANNEL_BETA) {
     kDisabledProbability = 1;
   }
   scoped_refptr<base::FieldTrial> omnibox_prerender_trial(
       base::FieldTrialList::FactoryGetFieldTrial(
           kOmniboxTrialName, kDivisor, "OmniboxPrerenderEnabled",
           2012, 12, 30, &g_omnibox_trial_default_group_number));
   omnibox_prerender_trial->AppendGroup("OmniboxPrerenderDisabled",
                                        kDisabledProbability);
-
-  // Field trial to set weighting of hits.
-  const base::FieldTrial::Probability kFourProbability = 33;
-  const base::FieldTrial::Probability kEightProbability = 33;
-
-  scoped_refptr<base::FieldTrial> weighting_trial(
-      base::FieldTrialList::FactoryGetFieldTrial(
-          "OmniboxPrerenderHitWeightingTrial", kDivisor,
-          "OmniboxPrerenderWeight1.0", 2012, 8, 30, NULL));
-  const int kOmniboxWeightFourGroup =
-      weighting_trial->AppendGroup("OmniboxPrerenderWeight4.0",
-                                   kFourProbability);
-  const int kOmniboxWeightEightGroup =
-      weighting_trial->AppendGroup("OmniboxPrerenderWeight8.0",
-                                   kEightProbability);
-  const int group = weighting_trial->group();
-  if (group == kOmniboxWeightFourGroup)
-    predictors::AutocompleteActionPredictor::set_hit_weight(4.0);
-  else if (group == kOmniboxWeightEightGroup)
-    predictors::AutocompleteActionPredictor::set_hit_weight(8.0);
 }
 
 bool IsOmniboxEnabled(Profile* profile) {
   if (!profile || profile->IsOffTheRecord())
     return false;
 
   if (!PrerenderManager::IsPrerenderingPossible())
     return false;
 
   // Override any field trial groups if the user has set a command line flag.
@@ skipping 11 matching lines @@
 
     DCHECK(switch_value == switches::kPrerenderFromOmniboxSwitchValueAuto);
   }
 
   const int group = base::FieldTrialList::FindValue(kOmniboxTrialName);
   return group == base::FieldTrial::kNotFinalized ||
          group == g_omnibox_trial_default_group_number;
 }
 
 }  // namespace prerender