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

media/base/media_file_checker.cc

 // 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 "media/base/media_file_checker.h"
 
 #include <map>
 
 #include "base/bind.h"
 #include "base/time/time.h"
 #include "media/ffmpeg/ffmpeg_common.h"
 #include "media/filters/blocking_url_protocol.h"
 #include "media/filters/ffmpeg_glue.h"
 #include "media/filters/file_data_source.h"
 
 namespace media {
 
 static const int64 kMaxCheckTimeInSeconds = 5;
 
 static void OnError(bool* called) {
   *called = false;
 }
 
-MediaFileChecker::MediaFileChecker(const base::PlatformFile& file)
-    : file_(file),
-      file_closer_(&file_) {
+MediaFileChecker::MediaFileChecker(base::File file) : file_(file.Pass()) {
 }
 
 MediaFileChecker::~MediaFileChecker() {
 }
 
 bool MediaFileChecker::Start(base::TimeDelta check_time) {
-  media::FileDataSource source;
+  media::FileDataSource source(file_.Pass());
   bool read_ok = true;
   media::BlockingUrlProtocol protocol(&source, base::Bind(&OnError, &read_ok));
   media::FFmpegGlue glue(&protocol);
-  source.InitializeFromPlatformFile(file_);
   AVFormatContext* format_context = glue.format_context();
 
   if (!glue.OpenContext())
     return false;
 
   if (avformat_find_stream_info(format_context, NULL) < 0)
     return false;
 
   // Remember the codec context for any decodable audio or video streams.
   std::map<int, AVCodecContext*> stream_contexts;
@@ skipping 53 matching lines @@
       result = avcodec_decode_video2(av_context, frame.get(), &frame_decoded,
                                      &packet);
     }
     av_free_packet(&packet);
   } while (base::Time::Now() < deadline && read_ok && result >= 0);
 
   return read_ok && (result == AVERROR_EOF || result >= 0);
 }
 
 }  // namespace media