[Cleanup] Remove StringPrintf from global namespace

chrome/browser/chromeos/login/screen_locker_tester.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/chromeos/login/screen_locker_tester.h"
 
 #include <string>
 
 #include "base/string_util.h"
 #include "base/stringprintf.h"
@@ skipping 102 matching lines @@
 
   // Returns the WebUI object from the screen locker.
   content::WebUI* webui() const;
 
   DISALLOW_COPY_AND_ASSIGN(WebUIScreenLockerTester);
 };
 
 void WebUIScreenLockerTester::SetPassword(const std::string& password) {
   RenderViewHost()->ExecuteJavascriptInWebFrame(
       string16(),
-      ASCIIToUTF16(StringPrintf(
+      ASCIIToUTF16(base::StringPrintf(
           "$('pod-row').pods[0].passwordElement.value = '%s';",
           password.c_str())));
 }
 
 std::string WebUIScreenLockerTester::GetPassword() {
   std::string result;
   scoped_ptr<base::Value> v = content::ExecuteScriptAndGetValue(
       RenderViewHost(),
       "$('pod-row').pods[0].passwordElement.value;");
   CHECK(v->GetAsString(&result));
@@ skipping 72 matching lines @@
       new MockAuthenticator(ScreenLocker::screen_locker_, user, password));
 }
 
 }  // namespace test
 
 test::ScreenLockerTester* ScreenLocker::GetTester() {
   return new test::WebUIScreenLockerTester();
 }
 
 }  // namespace chromeos