Convert base::MemoryMappedFile to use File instead of PlatformFile.

chrome/utility/chrome_content_utility_client.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/utility/chrome_content_utility_client.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 734 matching lines @@
       IPC::PlatformFileForTransitToPlatformFile(zip_file), &results);
   Send(new ChromeUtilityHostMsg_AnalyzeZipFileForDownloadProtection_Finished(
       results));
   ReleaseProcessIfNeeded();
 }
 
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 void ChromeContentUtilityClient::OnCheckMediaFile(
     int64 milliseconds_of_decoding,
     const IPC::PlatformFileForTransit& media_file) {
-  media::MediaFileChecker
-      checker(IPC::PlatformFileForTransitToPlatformFile(media_file));
+  media::MediaFileChecker checker(
+      base::File(IPC::PlatformFileForTransitToPlatformFile(media_file)));
   const bool check_success = checker.Start(
       base::TimeDelta::FromMilliseconds(milliseconds_of_decoding));
   Send(new ChromeUtilityHostMsg_CheckMediaFile_Finished(check_success));
   ReleaseProcessIfNeeded();
 }
 #endif  // !defined(OS_ANDROID) && !defined(OS_IOS)
 
 #if defined(OS_WIN)
 void ChromeContentUtilityClient::OnParseITunesPrefXml(
     const std::string& itunes_xml_data) {
@@ skipping 60 matching lines @@
   picasa::PicasaAlbumsIndexer indexer(album_uids);
   indexer.ParseFolderINI(folders_inis);
 
   Send(new ChromeUtilityHostMsg_IndexPicasaAlbumsContents_Finished(
       indexer.albums_images()));
   ReleaseProcessIfNeeded();
 }
 #endif  // defined(OS_WIN) || defined(OS_MACOSX)
 
 }  // namespace chrome