[Cleanup] Remove StringPrintf from global namespace

chrome/common/metrics/variations/uniformity_field_trials.cc

 // Copyright (c) 2013 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/common/metrics/variations/uniformity_field_trials.h"
 
 #include "base/metrics/field_trial.h"
 #include "base/stringprintf.h"
 #include "base/time.h"
 #include "chrome/common/metrics/variations/variations_util.h"
@@ skipping 10 matching lines @@
     const chrome_variations::VariationID trial_base_id,
     int num_trial_groups) {
   // Probability per group remains constant for all uniformity trials, what
   // changes is the probability divisor.
   static const base::FieldTrial::Probability kProbabilityPerGroup = 1;
   const std::string kDefaultGroupName = "default";
   const base::FieldTrial::Probability divisor = num_trial_groups;
 
   DCHECK_EQ(100 % num_trial_groups, 0);
   const int group_percent = 100 / num_trial_groups;
-  const std::string trial_name = StringPrintf(trial_name_string.c_str(),
-                                              group_percent);
+  const std::string trial_name = base::StringPrintf(trial_name_string.c_str(),
+                                                    group_percent);
 
   DVLOG(1) << "Trial name = " << trial_name;
 
   scoped_refptr<base::FieldTrial> trial(
       base::FieldTrialList::FactoryGetFieldTrial(
           trial_name, divisor, kDefaultGroupName, 2015, 1, 1, NULL));
   if (one_time_randomized)
     trial->UseOneTimeRandomization();
   chrome_variations::AssociateGoogleVariationID(
       chrome_variations::GOOGLE_WEB_PROPERTIES, trial_name, kDefaultGroupName,
       trial_base_id);
   chrome_variations::AssociateGoogleVariationID(
       chrome_variations::GOOGLE_UPDATE_SERVICE, trial_name, kDefaultGroupName,
       trial_base_id);
 
   // Loop starts with group 1 because the field trial automatically creates a
   // default group, which would be group 0.
   for (int group_number = 1; group_number < num_trial_groups; ++group_number) {
-    const std::string group_name = StringPrintf("group_%02d", group_number);
+    const std::string group_name =
+          base::StringPrintf("group_%02d", group_number);
     DVLOG(1) << "    Group name = " << group_name;
     trial->AppendGroup(group_name, kProbabilityPerGroup);
     chrome_variations::AssociateGoogleVariationID(
         chrome_variations::GOOGLE_WEB_PROPERTIES, trial_name, group_name,
         static_cast<chrome_variations::VariationID>(trial_base_id +
                                                     group_number));
     chrome_variations::AssociateGoogleVariationID(
         chrome_variations::GOOGLE_UPDATE_SERVICE, trial_name, group_name,
         static_cast<chrome_variations::VariationID>(trial_base_id +
                                                     group_number));
@@ skipping 58 matching lines @@
   // Setup a 5% session-randomized uniformity trial.
   const std::string kSessionRandomizedTrialName =
       "UMA-Session-Randomized-Uniformity-Trial-%d-Percent";
   SetupSingleUniformityFieldTrial(false, kSessionRandomizedTrialName,
       chrome_variations::UNIFORMITY_SESSION_RANDOMIZED_5_PERCENT_BASE, 20);
 
   SetupNewInstallUniformityTrial(install_date);
 }
 
 }  // namespace chrome_variations