Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/chromeos/extensions/default_app_order_unittest.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/extensions/default_app_order.h"
 
 #include <string>
 #include <vector>
 
 #include "base/file_util.h"
@@ skipping 38 matching lines @@
   }
 
   void SetExternalFile(const base::FilePath& path) {
     path_override_.reset(new base::ScopedPathOverride(
         chromeos::FILE_DEFAULT_APP_ORDER, path));
   }
 
   void CreateExternalOrderFile(const std::string& content) {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     base::FilePath external_file = temp_dir_.path().Append(kTestFile);
-    file_util::WriteFile(external_file, content.c_str(), content.size());
+    base::WriteFile(external_file, content.c_str(), content.size());
     SetExternalFile(external_file);
   }
 
  private:
   std::vector<std::string> built_in_default_;
 
   base::ScopedTempDir temp_dir_;
   scoped_ptr<base::ScopedPathOverride> path_override_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultAppOrderTest);
@@ skipping 48 matching lines @@
 
   scoped_ptr<default_app_order::ExternalLoader> loader(
       new default_app_order::ExternalLoader(false));
 
   std::vector<std::string> apps;
   default_app_order::Get(&apps);
   EXPECT_TRUE(IsBuiltInDefault(apps));
 }
 
 }  // namespace chromeos