[Cleanup] Remove StringPrintf from global namespace

chromeos/network/network_event_log_unittest.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_event_log.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 80 matching lines @@
   std::string output_newest_first_short = network_event_log::GetAsString(
       network_event_log::NEWEST_FIRST, 2);
   output_newest_first_short = SkipTime(output_newest_first_short);
   EXPECT_EQ(expected_output_newest_first_short, output_newest_first_short);
 }
 
 TEST_F(NetworkEventLogTest, TestMaxNetworkEvents) {
   const size_t entries_to_add =
       network_event_log::kMaxNetworkEventLogEntries + 3;
   for (size_t i = 0; i < entries_to_add; ++i)
-    network_event_log::AddEntry("test", StringPrintf("event_%"PRIuS, i), "");
+    network_event_log::AddEntry("test",
+                                base::StringPrintf("event_%"PRIuS, i), "");
 
   std::string output = GetAsString(network_event_log::OLDEST_FIRST, 0);
   size_t output_lines = CountLines(output);
   EXPECT_EQ(network_event_log::kMaxNetworkEventLogEntries, output_lines);
 }
 
 }  // namespace chromeos