Move WriteFile and WriteFileDescriptor from file_util to base namespace.

components/storage_monitor/image_capture_device_manager_unittest.mm

 // Copyright 2014 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.
 
 #import <Foundation/Foundation.h>
 #import <ImageCaptureCore/ImageCaptureCore.h>
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 92 matching lines @@
                 contextInfo:(void*)contextInfo {
   base::FilePath saveDir(base::SysNSStringToUTF8(
       [[options objectForKey:ICDownloadsDirectoryURL] path]));
   std::string saveAsFilename =
       base::SysNSStringToUTF8([options objectForKey:ICSaveAsFilename]);
   // It appears that the ImageCapture library adds an extension to the requested
   // filename. Do that here to require a rename.
   saveAsFilename += ".jpg";
   base::FilePath toBeSaved = saveDir.Append(saveAsFilename);
   ASSERT_EQ(static_cast<int>(strlen(kTestFileContents)),
-            file_util::WriteFile(toBeSaved, kTestFileContents,
-                                 strlen(kTestFileContents)));
+            base::WriteFile(toBeSaved, kTestFileContents,
+                            strlen(kTestFileContents)));
 
   NSMutableDictionary* returnOptions =
       [NSMutableDictionary dictionaryWithDictionary:options];
   [returnOptions setObject:base::SysUTF8ToNSString(saveAsFilename)
                     forKey:ICSavedFilename];
 
   [static_cast<NSObject<ICCameraDeviceDownloadDelegate>*>(downloadDelegate)
    didDownloadFile:file
              error:nil
            options:returnOptions
@@ skipping 304 matching lines @@
   char file_contents[5];
   ASSERT_EQ(4, base::ReadFile(temp_file, file_contents,
                               strlen(kTestFileContents)));
   EXPECT_EQ(kTestFileContents,
             std::string(file_contents, strlen(kTestFileContents)));
 
   [camera didRemoveDevice:device];
 }
 
 }  // namespace storage_monitor