[Cleanup] Remove StringPrintf from global namespace

chrome/browser/prerender/prerender_histograms.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_histograms.h"
 
 #include <string>
 
 #include "base/format_macros.h"
 #include "base/metrics/field_trial.h"
@@ skipping 144 matching lines @@
   // reset the window to begin at the most recent occurrence, so that we will
   // always be in a window in the 30 seconds from each occurrence.
   last_prerender_seen_time_ = GetCurrentTimeTicks();
   seen_any_pageload_ = false;
   seen_pageload_started_after_prerender_ = false;
 }
 
 void PrerenderHistograms::RecordPrerenderStarted(Origin origin) const {
   if (OriginIsOmnibox(origin)) {
     UMA_HISTOGRAM_ENUMERATION(
-        StringPrintf("Prerender.OmniboxPrerenderCount%s",
-                     PrerenderManager::GetModeString()), 1, 2);
+        base::StringPrintf("Prerender.OmniboxPrerenderCount%s",
+                           PrerenderManager::GetModeString()), 1, 2);
   }
 }
 
 void PrerenderHistograms::RecordConcurrency(size_t prerender_count) const {
   static const size_t kMaxRecordableConcurrency = 20;
   DCHECK_GE(kMaxRecordableConcurrency, Config().max_link_concurrency);
   UMA_HISTOGRAM_ENUMERATION(
-      StringPrintf("Prerender.PrerenderCountOf%" PRIuS "Max",
-                   kMaxRecordableConcurrency),
+      base::StringPrintf("Prerender.PrerenderCountOf%" PRIuS "Max",
+                         kMaxRecordableConcurrency),
       prerender_count, kMaxRecordableConcurrency + 1);
 }
 
 void PrerenderHistograms::RecordUsedPrerender(Origin origin) const {
   if (OriginIsOmnibox(origin)) {
     UMA_HISTOGRAM_ENUMERATION(
-        StringPrintf("Prerender.OmniboxNavigationsUsedPrerenderCount%s",
-                     PrerenderManager::GetModeString()), 1, 2);
+        base::StringPrintf("Prerender.OmniboxNavigationsUsedPrerenderCount%s",
+                           PrerenderManager::GetModeString()), 1, 2);
   }
 }
 
 void PrerenderHistograms::RecordTimeSinceLastRecentVisit(
     Origin origin,
     base::TimeDelta delta) const {
   PREFIXED_HISTOGRAM(
       "TimeSinceLastRecentVisit", origin,
       UMA_HISTOGRAM_TIMES(name, delta));
 }
@@ skipping 193 matching lines @@
   return last_experiment_id_;
 }
 
 bool PrerenderHistograms::IsOriginExperimentWash() const {
   if (!WithinWindow())
     return false;
   return origin_experiment_wash_;
 }
 
 }  // namespace prerender