[Cleanup] Remove StringPrintf from global namespace

chrome/browser/predictors/autocomplete_action_predictor.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/predictors/autocomplete_action_predictor.h"
 
 #include <math.h>
 
 #include <vector>
 
@@ skipping 312 matching lines @@
 }
 
 void AutocompleteActionPredictor::OnOmniboxOpenedUrl(
     const AutocompleteLog& log) {
   if (log.text.length() < kMinimumUserTextLength)
     return;
 
   const AutocompleteMatch& match = log.result.match_at(log.selected_index);
 
   UMA_HISTOGRAM_BOOLEAN(
-      StringPrintf("Prerender.OmniboxNavigationsCouldPrerender%s",
-                   prerender::PrerenderManager::GetModeString()).c_str(),
+      base::StringPrintf("Prerender.OmniboxNavigationsCouldPrerender%s",
+                         prerender::PrerenderManager::GetModeString()).c_str(),
       prerender::IsOmniboxEnabled(profile_));
 
   const GURL& opened_url = match.destination_url;
   const string16 lower_user_text(base::i18n::ToLower(log.text));
 
   // Traverse transitional matches for those that have a user_text that is a
   // prefix of |lower_user_text|.
   std::vector<AutocompleteActionPredictorTable::Row> rows_to_add;
   std::vector<AutocompleteActionPredictorTable::Row> rows_to_update;
 
@@ skipping 232 matching lines @@
   return number_of_hits / (number_of_hits + value.number_of_misses);
 }
 
 AutocompleteActionPredictor::TransitionalMatch::TransitionalMatch() {
 }
 
 AutocompleteActionPredictor::TransitionalMatch::~TransitionalMatch() {
 }
 
 }  // namespace predictors