[Cleanup] Remove StringPrintf from global namespace

chrome/browser/extensions/api/declarative/initializing_rules_registry.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/extensions/api/declarative/initializing_rules_registry.h"
 
 #include "base/logging.h"
 #include "base/stringprintf.h"
 #include "base/values.h"
 
 namespace {
 std::string ToId(int identifier) {
-  return StringPrintf("_%d_", identifier);
+  return base::StringPrintf("_%d_", identifier);
 }
 }  // namespace
 
 namespace extensions {
 
 InitializingRulesRegistry::InitializingRulesRegistry(
     scoped_refptr<RulesRegistry> delegate)
     : delegate_(delegate),
       last_generated_rule_identifier_id_(0) {
 }
@@ skipping 117 matching lines @@
   for (i = identifiers.begin(); i != identifiers.end(); ++i)
     used_rule_identifiers_[extension_id].erase(*i);
 }
 
 void InitializingRulesRegistry::RemoveAllUsedRuleIdentifiers(
     const std::string& extension_id) {
   used_rule_identifiers_.erase(extension_id);
 }
 
 }  // namespace extensions