[Cleanup] Remove StringPrintf from global namespace

net/proxy/proxy_resolver_v8_tracing.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 "net/proxy/proxy_resolver_v8_tracing.h"
 
 #include "base/bind.h"
 #include "base/message_loop_proxy.h"
 #include "base/metrics/histogram.h"
 #include "base/stringprintf.h"
@@ skipping 935 matching lines @@
   // The non-ex flavors are limited to IPv4 results.
   if (op == MY_IP_ADDRESS || op == DNS_RESOLVE) {
     info.set_address_family(ADDRESS_FAMILY_IPV4);
   }
 
   return info;
 }
 
 std::string ProxyResolverV8Tracing::Job::MakeDnsCacheKey(
     const std::string& host, ResolveDnsOperation op) {
-  return StringPrintf("%d:%s", op, host.c_str());
+  return base::StringPrintf("%d:%s", op, host.c_str());
 }
 
 void ProxyResolverV8Tracing::Job::HandleAlertOrError(bool is_alert,
                                                      int line_number,
                                                      const string16& message) {
   CheckIsOnWorkerThread();
 
   if (cancelled_.IsSet())
     return;
 
@@ skipping 174 matching lines @@
   DCHECK(!set_pac_script_job_);
   CHECK_EQ(0, num_outstanding_callbacks_);
 
   set_pac_script_job_ = new Job(this);
   set_pac_script_job_->StartSetPacScript(script_data, callback);
 
   return ERR_IO_PENDING;
 }
 
 }  // namespace net