[Cleanup] Remove StringPrintf from global namespace

chromeos/network/network_util.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 "chromeos/network/network_util.h"
 
 #include "base/stringprintf.h"
 #include "base/strings/string_tokenizer.h"
 
 namespace chromeos {
@@ skipping 25 matching lines @@
     if (prefix_length >= 8) {
       prefix_length -= 8;
     } else {
       remainder = prefix_length;
       prefix_length = 0;
     }
     if (i > 0)
       netmask += ".";
     int value = remainder == 0 ? 0 :
         ((2L << (remainder - 1)) - 1) << (8 - remainder);
-    netmask += StringPrintf("%d", value);
+    netmask += base::StringPrintf("%d", value);
   }
   return netmask;
 }
 
 int32 NetmaskToPrefixLength(const std::string& netmask) {
   int count = 0;
   int prefix_length = 0;
   base::StringTokenizer t(netmask, ".");
   while (t.GetNext()) {
     // If there are more than 4 numbers, then it's invalid.
@@ skipping 30 matching lines @@
     }
     count++;
   }
   if (count < 4)
     return -1;
   return prefix_length;
 }
 
 }  // namespace network_util
 }  // namespace chromeos