Move file_util::Delete to the base namespace

remoting/host/pairing_registry_delegate_linux_unittest.cc

 // Copyright 2013 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 "remoting/host/pairing_registry_delegate_linux.h"
 
 #include "base/file_util.h"
 #include "base/message_loop.h"
 #include "base/run_loop.h"
 #include "base/task_runner.h"
@@ skipping 52 matching lines @@
   std::string test_data = "test data";
   save_delegate->Save(
       test_data,
       base::Bind(&PairingRegistryDelegateLinuxTest::SaveComplete,
                  base::Unretained(this),
                  load_delegate.get(),
                  test_data));
 
   run_loop.Run();
 
-  file_util::Delete(temp_dir, true);
+  base::Delete(temp_dir, true);
 };
 
 }  // namespace remoting