Remove MediaFormat once and for all.

media/filters/file_data_source.h

Index: media/filters/file_data_source.h
diff --git a/media/filters/file_data_source.h b/media/filters/file_data_source.h
index 27e0d0ed6125f5371ab56927f04f0fe29beb3503..10e61aa75d8bae7a7df06dad3fafe6e569d84450 100644
--- a/media/filters/file_data_source.h
+++ b/media/filters/file_data_source.h
@@ -27,7 +27,6 @@ class FileDataSource : public DataSource {
   virtual void Stop(FilterCallback* callback);
 
   // Implementation of DataSource.
-  virtual const MediaFormat& media_format();
   virtual void Read(int64 position, size_t size, uint8* data,
                     ReadCallback* read_callback);
   virtual bool GetSize(int64* size_out);
@@ -49,9 +48,6 @@ class FileDataSource : public DataSource {
   // Size of the file in bytes.
   int64 file_size_;
 
-  // Media format handed out by the DataSource::GetMediaFormat method.
-  MediaFormat media_format_;
-
   // Critical section that protects all of the DataSource methods to prevent
   // a Stop from happening while in the middle of a file I/O operation.
   // TODO(ralphl): Ideally this would use asynchronous I/O or we will know