diff --git a/dom/media/MediaStreamGraph.cpp b/dom/media/MediaStreamGraph.cpp
index 1730f26c5c62..0328c856c15c 100644
--- a/dom/media/MediaStreamGraph.cpp
+++ b/dom/media/MediaStreamGraph.cpp
@@ -751,21 +751,6 @@ MediaStreamGraphImpl::AddBlockingRelatedStreamsToSet(nsTArray<MediaStream*>* aSt
     return;
   aStream->mInBlockingSet = true;
   aStreams->AppendElement(aStream);
-  for (uint32_t i = 0; i < aStream->mConsumers.Length(); ++i) {
-    MediaInputPort* port = aStream->mConsumers[i];
-    if (port->mFlags & (MediaInputPort::FLAG_BLOCK_INPUT | MediaInputPort::FLAG_BLOCK_OUTPUT)) {
-      AddBlockingRelatedStreamsToSet(aStreams, port->mDest);
-    }
-  }
-  ProcessedMediaStream* ps = aStream->AsProcessedStream();
-  if (ps) {
-    for (uint32_t i = 0; i < ps->mInputs.Length(); ++i) {
-      MediaInputPort* port = ps->mInputs[i];
-      if (port->mFlags & (MediaInputPort::FLAG_BLOCK_INPUT | MediaInputPort::FLAG_BLOCK_OUTPUT)) {
-        AddBlockingRelatedStreamsToSet(aStreams, port->mSource);
-      }
-    }
-  }
 }
 
 void
@@ -774,21 +759,6 @@ MediaStreamGraphImpl::MarkStreamBlocking(MediaStream* aStream)
   if (aStream->mBlockInThisPhase)
     return;
   aStream->mBlockInThisPhase = true;
-  for (uint32_t i = 0; i < aStream->mConsumers.Length(); ++i) {
-    MediaInputPort* port = aStream->mConsumers[i];
-    if (port->mFlags & MediaInputPort::FLAG_BLOCK_OUTPUT) {
-      MarkStreamBlocking(port->mDest);
-    }
-  }
-  ProcessedMediaStream* ps = aStream->AsProcessedStream();
-  if (ps) {
-    for (uint32_t i = 0; i < ps->mInputs.Length(); ++i) {
-      MediaInputPort* port = ps->mInputs[i];
-      if (port->mFlags & MediaInputPort::FLAG_BLOCK_INPUT) {
-        MarkStreamBlocking(port->mSource);
-      }
-    }
-  }
 }
 
 void
@@ -2792,7 +2762,7 @@ ProcessedMediaStream::AllocateInputPort(MediaStream* aStream,
     }
     nsRefPtr<MediaInputPort> mPort;
   };
-  nsRefPtr<MediaInputPort> port = new MediaInputPort(aStream, this, 0,
+  nsRefPtr<MediaInputPort> port = new MediaInputPort(aStream, this,
                                                      aInputNumber, aOutputNumber);
   port->SetGraphImpl(GraphImpl());
   GraphImpl()->AppendMessage(new Message(port));
diff --git a/dom/media/MediaStreamGraph.h b/dom/media/MediaStreamGraph.h
index a4b64b054036..d8a5b8a6c8b4 100644
--- a/dom/media/MediaStreamGraph.h
+++ b/dom/media/MediaStreamGraph.h
@@ -995,11 +995,9 @@ class MediaInputPort final
 private:
   // Do not call this constructor directly. Instead call aDest->AllocateInputPort.
   MediaInputPort(MediaStream* aSource, ProcessedMediaStream* aDest,
-                 uint32_t aFlags, uint16_t aInputNumber,
-                 uint16_t aOutputNumber)
+                 uint16_t aInputNumber, uint16_t aOutputNumber)
     : mSource(aSource)
     , mDest(aDest)
-    , mFlags(aFlags)
     , mInputNumber(aInputNumber)
     , mOutputNumber(aOutputNumber)
     , mGraph(nullptr)
@@ -1016,20 +1014,6 @@ private:
 public:
   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MediaInputPort)
 
-  /**
-   * The FLAG_BLOCK_INPUT and FLAG_BLOCK_OUTPUT flags can be used to control
-   * exactly how the blocking statuses of the input and output streams affect
-   * each other.
-   */
-  enum {
-    // When set, blocking on the output stream forces blocking on the input
-    // stream.
-    FLAG_BLOCK_INPUT = 0x01,
-    // When set, blocking on the input stream forces blocking on the output
-    // stream.
-    FLAG_BLOCK_OUTPUT = 0x02
-  };
-
   // Called on graph manager thread
   // Do not call these from outside MediaStreamGraph.cpp!
   void Init();
@@ -1093,7 +1077,6 @@ private:
   // Never modified after Init()
   MediaStream* mSource;
   ProcessedMediaStream* mDest;
-  uint32_t mFlags;
   // The input and output numbers are optional, and are currently only used by
   // Web Audio.
   const uint16_t mInputNumber;