[Cleanup] Remove StringPrintf from global namespace

webkit/fileapi/obfuscated_file_util.cc

Index: webkit/fileapi/obfuscated_file_util.cc
diff --git a/webkit/fileapi/obfuscated_file_util.cc b/webkit/fileapi/obfuscated_file_util.cc
index 7031172ed9b22dad274c8bb7e4c837e51def0662..6f9a900528c7903a9e161b42cac67553d80c81b5 100644
--- a/webkit/fileapi/obfuscated_file_util.cc
+++ b/webkit/fileapi/obfuscated_file_util.cc
@@ -1323,14 +1323,15 @@ PlatformFileError ObfuscatedFileUtil::GenerateNewLocalPath(
   // We use the third- and fourth-to-last digits as the directory.
   int64 directory_number = number % 10000 / 100;
   new_local_path = new_local_path.AppendASCII(
-      StringPrintf("%02" PRId64, directory_number));
+      base::StringPrintf("%02" PRId64, directory_number));
 
   error = NativeFileUtil::CreateDirectory(
       new_local_path, false /* exclusive */, false /* recursive */);
   if (error != base::PLATFORM_FILE_OK)
     return error;
 
-  *local_path = new_local_path.AppendASCII(StringPrintf("%08" PRId64, number));
+  *local_path =
+      new_local_path.AppendASCII(base::StringPrintf("%08" PRId64, number));
   return base::PLATFORM_FILE_OK;
 }