Move WriteFile and WriteFileDescriptor from file_util to base namespace.

remoting/host/setup/daemon_controller_delegate_mac.mm

 // 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 <CoreFoundation/CoreFoundation.h>
 
 #include "remoting/host/setup/daemon_controller_delegate_mac.h"
 
 #include <launch.h>
 #include <stdio.h>
@@ skipping 212 matching lines @@
 bool DaemonControllerDelegateMac::DoShowPreferencePane(
     const std::string& config_data) {
   if (!config_data.empty()) {
     base::FilePath config_path;
     if (!base::GetTempDir(&config_path)) {
       LOG(ERROR) << "Failed to get filename for saving configuration data.";
       return false;
     }
     config_path = config_path.Append(kHostConfigFileName);
 
-    int written = file_util::WriteFile(config_path, config_data.data(),
+    int written = base::WriteFile(config_path, config_data.data(),
                                        config_data.size());
     if (written != static_cast<int>(config_data.size())) {
       LOG(ERROR) << "Failed to save configuration data to: "
                  << config_path.value();
       return false;
     }
   }
 
   base::FilePath pane_path;
   // TODO(lambroslambrou): Use NSPreferencePanesDirectory once we start
@@ skipping 42 matching lines @@
   self->PreferencePaneCallbackDelegate(name);
 }
 
 scoped_refptr<DaemonController> DaemonController::Create() {
   scoped_ptr<DaemonController::Delegate> delegate(
       new DaemonControllerDelegateMac());
   return new DaemonController(delegate.Pass());
 }
 
 }  // namespace remoting