Clean up the unused Suggest field trial and make GetActiveSuggestFieldTrialHash

chrome/browser/omnibox/omnibox_field_trial.h

 // 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.
 
 #ifndef CHROME_BROWSER_OMNIBOX_OMNIBOX_FIELD_TRIAL_H_
 #define CHROME_BROWSER_OMNIBOX_OMNIBOX_FIELD_TRIAL_H_
 
 #include <string>
+#include <vector>
 
 #include "base/basictypes.h"
 
 // This class manages the Omnibox field trials.
 class OmniboxFieldTrial {
  public:
   // Creates the static field trial groups.
   // *** MUST NOT BE CALLED MORE THAN ONCE. ***
   static void ActivateStaticTrials();
 
@@ skipping 22 matching lines @@
   static bool InDisallowInlineHQPFieldTrial();
 
   // Returns whether the user should get the experiment setup or
   // the default setup for this field trial.  The experiment
   // group prohibits inlining suggestions.
   static bool InDisallowInlineHQPFieldTrialExperimentGroup();
 
   // ---------------------------------------------------------
   // For the suggest field trial.
 
-  // Fills in |field_trial_hash| with a hash of the active suggest field trial
-  // name, if any.  Returns true if the suggest field trial was active and
-  // |field_trial_hash| was initialized.
-  static bool GetActiveSuggestFieldTrialHash(uint32* field_trial_hash);
+  // Populates |field_trial_hash| with hashes of the active suggest field trial
+  // names, if any.
+  static void GetActiveSuggestFieldTrialHashes(
+      std::vector<uint32>* field_trial_hash);
 
   // ---------------------------------------------------------
   // For the History Quick Provider new scoring field trial.
 
   // Returns whether the user is in any field trial group for this
   // field trial.  False indicates that the field trial wasn't
   // successfully created for some reason.
   static bool InHQPNewScoringFieldTrial();
 
   // Returns whether the user should get the experimental setup or
@@ skipping 40 matching lines @@
   // URL database and directs HistoryQuick provider to calculate both
   // HUP-style and HQP-style scores for matches, then return whichever
   // is larger.
   static bool InHQPReplaceHUPScoringFieldTrialExperimentGroup();
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(OmniboxFieldTrial);
 };
 
 #endif  // CHROME_BROWSER_OMNIBOX_OMNIBOX_FIELD_TRIAL_H_