[Cleanup] Remove StringPrintf from global namespace

chrome/browser/extensions/extension_browsertest.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/extensions/extension_browsertest.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 119 matching lines @@
   // Find the loaded extension by its path. See crbug.com/59531 for why
   // we cannot just use last_loaded_extension_id_.
   const Extension* extension = GetExtensionByPath(service->extensions(), path);
   if (!extension)
     return NULL;
 
   if (!(flags & kFlagIgnoreManifestWarnings)) {
     const std::vector<extensions::InstallWarning>& install_warnings =
         extension->install_warnings();
     if (!install_warnings.empty()) {
-      std::string install_warnings_message = StringPrintf(
+      std::string install_warnings_message = base::StringPrintf(
           "Unexpected warnings when loading test extension %s:\n",
           path.AsUTF8Unsafe().c_str());
 
       for (std::vector<extensions::InstallWarning>::const_iterator it =
           install_warnings.begin(); it != install_warnings.end(); ++it) {
         install_warnings_message += "  " + it->message + "\n";
       }
 
       EXPECT_TRUE(extension->install_warnings().empty()) <<
           install_warnings_message;
@@ skipping 575 matching lines @@
     case content::NOTIFICATION_LOAD_STOP:
       VLOG(1) << "Got LOAD_STOP notification.";
       MessageLoopForUI::current()->Quit();
       break;
 
     default:
       NOTREACHED();
       break;
   }
 }