Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/download/chrome_download_manager_delegate_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 "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/pref_service.h"
 #include "base/run_loop.h"
@@ skipping 368 matching lines @@
     VerifyAndClearExpectations();
   }
 }
 
 TEST_F(ChromeDownloadManagerDelegateTest, CheckForFileExistence) {
   const char kData[] = "helloworld";
   const size_t kDataLength = sizeof(kData) - 1;
   base::FilePath existing_path = default_download_path().AppendASCII("foo");
   base::FilePath non_existent_path =
       default_download_path().AppendASCII("bar");
-  file_util::WriteFile(existing_path, kData, kDataLength);
+  base::WriteFile(existing_path, kData, kDataLength);
 
   scoped_ptr<content::MockDownloadItem> download_item(
       CreateActiveDownloadItem(1));
   EXPECT_CALL(*download_item, GetTargetFilePath())
       .WillRepeatedly(ReturnRef(existing_path));
   EXPECT_TRUE(CheckForFileExistence(download_item.get()));
 
   download_item.reset(CreateActiveDownloadItem(1));
   EXPECT_CALL(*download_item, GetTargetFilePath())
       .WillRepeatedly(ReturnRef(non_existent_path));
   EXPECT_FALSE(CheckForFileExistence(download_item.get()));
 }