--- a/dom/media/MediaDecoderReaderWrapper.cpp
+++ b/dom/media/MediaDecoderReaderWrapper.cpp
@@ -6,18 +6,17 @@
 
 #include "mozilla/MozPromise.h"
 #include "MediaDecoderReaderWrapper.h"
 
 namespace mozilla {
 
 MediaDecoderReaderWrapper::MediaDecoderReaderWrapper(AbstractThread* aOwnerThread,
                                                      MediaDecoderReader* aReader)
-  : mForceZeroStartTime(aReader->ForceZeroStartTime())
-  , mOwnerThread(aOwnerThread)
+  : mOwnerThread(aOwnerThread)
   , mReader(aReader)
 {}
 
 MediaDecoderReaderWrapper::~MediaDecoderReaderWrapper()
 {}
 
 media::TimeUnit
 MediaDecoderReaderWrapper::StartTime() const

--- a/dom/media/MediaDecoderReaderWrapper.h
+++ b/dom/media/MediaDecoderReaderWrapper.h
@@ -116,17 +116,16 @@ public:
 private:
   ~MediaDecoderReaderWrapper();
 
   void OnMetadataRead(MetadataHolder* aMetadata);
   void OnMetadataNotRead() {}
   MediaCallbackExc<WaitCallbackData>& WaitCallbackRef(MediaData::Type aType);
   MozPromiseRequestHolder<WaitForDataPromise>& WaitRequestRef(MediaData::Type aType);
 
-  const bool mForceZeroStartTime;
   const RefPtr<AbstractThread> mOwnerThread;
   const RefPtr<MediaDecoderReader> mReader;
 
   bool mShutdown = false;
   Maybe<media::TimeUnit> mStartTime;
 
   MozPromiseRequestHolder<MediaDataPromise> mAudioDataRequest;
   MozPromiseRequestHolder<MediaDataPromise> mVideoDataRequest;