Separate DemuxerHost from DataSourceHost.

media/filters/file_data_source.cc

Index: media/filters/file_data_source.cc
diff --git a/media/filters/file_data_source.cc b/media/filters/file_data_source.cc
index 8fb310091754f73180bacd029ac9bab8a49ed9b0..e8b3292898f5d9d6c62feb260ed29695f44ed759 100644
--- a/media/filters/file_data_source.cc
+++ b/media/filters/file_data_source.cc
@@ -18,25 +18,12 @@ FileDataSource::FileDataSource()
 FileDataSource::FileDataSource(base::File file)
     : force_read_errors_(false),
       force_streaming_(false) {
-  if (!file_.Initialize(file.Pass()))
-    return;
-
-  UpdateHostBytes();
+  file_.Initialize(file.Pass());
 }
 
 bool FileDataSource::Initialize(const base::FilePath& file_path) {
   DCHECK(!file_.IsValid());
-
-  if (!file_.Initialize(file_path))
-    return false;
-
-  UpdateHostBytes();
-  return true;
-}
-
-void FileDataSource::set_host(DataSourceHost* host) {
-  DataSource::set_host(host);
-  UpdateHostBytes();
+  return file_.Initialize(file_path);
 }
 
 void FileDataSource::Stop(const base::Closure& callback) {
@@ -77,11 +64,4 @@ void FileDataSource::SetBitrate(int bitrate) {}
 
 FileDataSource::~FileDataSource() {}
 
-void FileDataSource::UpdateHostBytes() {
-  if (host() && file_.IsValid()) {
-    host()->SetTotalBytes(file_.length());
-    host()->AddBufferedByteRange(0, file_.length());
-  }
-}
-
 }  // namespace media