Calculate the buffered ranges in ChunkDemuxer::GetBufferedRanges()

media/filters/source_buffer_stream.cc

Index: media/filters/source_buffer_stream.cc
diff --git a/media/filters/source_buffer_stream.cc b/media/filters/source_buffer_stream.cc
index eebecb74ce4de1f0278a8a9e0687d0748c508a28..cf7233ebbd26a3fe4fc5a6553e99f55374c9bc9b 100644
--- a/media/filters/source_buffer_stream.cc
+++ b/media/filters/source_buffer_stream.cc
@@ -479,9 +479,8 @@ bool SourceBufferStream::GetNextBuffer(
   return selected_range_ && selected_range_->GetNextBuffer(out_buffer);
 }
 
-std::list<SourceBufferStream::Timespan>
-SourceBufferStream::GetBufferedTime() const {
-  std::list<Timespan> timespans;
+SourceBufferStream::TimespanList SourceBufferStream::GetBufferedTime() const {
+  TimespanList timespans;
   for (RangeList::const_iterator itr = ranges_.begin();
        itr != ranges_.end(); itr++) {
     timespans.push_back((*itr)->GetBufferedTime());