[Cleanup] Remove StringPrintf from global namespace

chrome/browser/automation/testing_automation_provider_chromeos.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/automation/testing_automation_provider.h"
 
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "base/command_line.h"
@@ skipping 1049 matching lines @@
     reply.SendError("Invalid or missing args.");
     return;
   }
 
   // Connect to a remembered VPN by its service_path. Valid service_paths
   // can be found in the dictionary returned by GetPrivateNetworkInfo.
   NetworkLibrary* network_library = CrosLibrary::Get()->GetNetworkLibrary();
   chromeos::VirtualNetwork* network =
       network_library->FindVirtualNetworkByPath(service_path);
   if (!network) {
-    reply.SendError(StringPrintf("No virtual network found: %s",
-                                 service_path.c_str()));
+    reply.SendError(base::StringPrintf("No virtual network found: %s",
+                                       service_path.c_str()));
     return;
   }
   if (network->NeedMoreInfoToConnect()) {
     reply.SendError("Virtual network is missing info required to connect.");
     return;
   };
 
   // Set up an observer (it will delete itself).
   new VirtualConnectObserver(this, reply_message, network->name());
   network_library->ConnectToVirtualNetwork(network);
@@ skipping 255 matching lines @@
   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->
       AddObserver(power_manager_observer_);
 }
 
 void TestingAutomationProvider::RemoveChromeosObservers() {
   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->
       RemoveObserver(power_manager_observer_);
   delete power_manager_observer_;
   power_manager_observer_ = NULL;
 }