Make ChunkDemuxer::SetTimestampOffset take a TimeDelta instead of double

webkit/media/webmediaplayer_proxy.cc

Index: webkit/media/webmediaplayer_proxy.cc
diff --git a/webkit/media/webmediaplayer_proxy.cc b/webkit/media/webmediaplayer_proxy.cc
index 100d591037bb9c88ed471a5bab78fc91eb9c45bc..bac3d8b62bf3b1f94537a996f6e60e0177c8142c 100644
--- a/webkit/media/webmediaplayer_proxy.cc
+++ b/webkit/media/webmediaplayer_proxy.cc
@@ -201,7 +201,7 @@ media::ChunkDemuxer::Status WebMediaPlayerProxy::DemuxerAddId(
 }
 
 bool WebMediaPlayerProxy::DemuxerSetTimestampOffset(
-    const std::string& id, double offset) {
+    const std::string& id, base::TimeDelta offset) {
   return chunk_demuxer_->SetTimestampOffset(id, offset);
 }