Remove MediaFormat once and for all.

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 da03e98e793b211eedf50198cdaf99c99fdd6991..04035dc590ad9657c0e3de7bb86b3636f67aeee1 100644
--- a/media/filters/file_data_source.cc
+++ b/media/filters/file_data_source.cc
@@ -37,8 +37,6 @@ PipelineStatus FileDataSource::Initialize(const std::string& url) {
     file_size_ = 0;
     return PIPELINE_ERROR_URL_NOT_FOUND;
   }
-  media_format_.SetAsString(MediaFormat::kURL, url);
-
   if (host()) {
     host()->SetTotalBytes(file_size_);
     host()->SetBufferedBytes(file_size_);
@@ -68,10 +66,6 @@ void FileDataSource::Stop(FilterCallback* callback) {
   }
 }
 
-const MediaFormat& FileDataSource::media_format() {
-  return media_format_;
-}
-
 void FileDataSource::Read(int64 position, size_t size, uint8* data,
                           ReadCallback* read_callback) {
   DCHECK(file_);