Enhance WebMediaPlayer::buffered() to account for evicted ranges.

media/blink/buffered_data_source.cc

Index: media/blink/buffered_data_source.cc
diff --git a/media/blink/buffered_data_source.cc b/media/blink/buffered_data_source.cc
index 91ed1a254c8c43cba43aa8011d0e2501cb6a3c51..8a37f889ef19518f28af0d38da60e86216092dbd 100644
--- a/media/blink/buffered_data_source.cc
+++ b/media/blink/buffered_data_source.cc
@@ -493,7 +493,8 @@ void BufferedDataSource::LoadingStateChangedCallback(
   downloading_cb_.Run(is_downloading_data);
 }
 
-void BufferedDataSource::ProgressCallback(int64 position) {
+void BufferedDataSource::ProgressCallback(int64 earliest_position,
+                                          int64 position) {
   DCHECK(render_task_runner_->BelongsToCurrentThread());
 
   if (assume_fully_buffered())
@@ -506,6 +507,7 @@ void BufferedDataSource::ProgressCallback(int64 position) {
     return;
 
   host_->AddBufferedByteRange(loader_->first_byte_position(), position);
+  host_->RemoveBufferedByteRange(earliest_position);
 }
 
 void BufferedDataSource::UpdateDeferStrategy(bool paused) {