diff --git a/dom/plugins/ipc/BrowserStreamChild.cpp b/dom/plugins/ipc/BrowserStreamChild.cpp
index 1a2acf6b74b6..b6428b994021 100644
--- a/dom/plugins/ipc/BrowserStreamChild.cpp
+++ b/dom/plugins/ipc/BrowserStreamChild.cpp
@@ -177,16 +177,6 @@ BrowserStreamChild::NPN_RequestRead(NPByteRange* aRangeList)
   return result;
 }
 
-void
-BrowserStreamChild::NPN_DestroyStream(NPReason reason)
-{
-  mStreamStatus = reason;
-  if (ALIVE == mState)
-    SendNPN_DestroyStream(reason);
-
-  EnsureDeliveryPending();
-}
-
 void
 BrowserStreamChild::EnsureDeliveryPending()
 {
@@ -275,7 +265,10 @@ BrowserStreamChild::DeliverPendingData()
     if (0 == r)
       return true;
     if (r < 0) { // error condition
-      NPN_DestroyStream(NPRES_NETWORK_ERR);
+      mStreamStatus = NPRES_NETWORK_ERR;
+
+      // Set up stream destruction
+      EnsureDeliveryPending();
       return false;
     }
     mPendingData[0].curpos += r;
diff --git a/dom/plugins/ipc/BrowserStreamChild.h b/dom/plugins/ipc/BrowserStreamChild.h
index f1916320c844..33ec05555302 100644
--- a/dom/plugins/ipc/BrowserStreamChild.h
+++ b/dom/plugins/ipc/BrowserStreamChild.h
@@ -54,7 +54,6 @@ public:
   }
 
   NPError NPN_RequestRead(NPByteRange* aRangeList);
-  void NPN_DestroyStream(NPReason reason);
 
   void NotifyPending() {
     NS_ASSERTION(!mNotifyPending, "Pending twice?");
@@ -85,7 +84,6 @@ public:
 
 private:
   friend class StreamNotifyChild;
-  using PBrowserStreamChild::SendNPN_DestroyStream;
 
   /**
    * Post an event to ensure delivery of pending data/destroy/urlnotify events
@@ -116,7 +114,7 @@ private:
   /**
    * The plugin's notion of whether a stream has been "closed" (no more
    * data delivery) differs from the plugin host due to asynchronous delivery
-   * of data and NPN_DestroyStream. While the plugin-visible stream is open,
+   * of data and stream destruction. While the plugin-visible stream is open,
    * mStreamStatus should be kStreamOpen (-1). mStreamStatus will be a
    * failure code if either the parent or child indicates stream failure.
    */
diff --git a/dom/plugins/ipc/BrowserStreamParent.cpp b/dom/plugins/ipc/BrowserStreamParent.cpp
index 8f0265112487..f17c691b243a 100644
--- a/dom/plugins/ipc/BrowserStreamParent.cpp
+++ b/dom/plugins/ipc/BrowserStreamParent.cpp
@@ -85,25 +85,6 @@ BrowserStreamParent::AnswerNPN_RequestRead(const IPCByteRanges& ranges,
   return IPC_OK();
 }
 
-mozilla::ipc::IPCResult
-BrowserStreamParent::RecvNPN_DestroyStream(const NPReason& reason)
-{
-  switch (mState) {
-  case ALIVE:
-    break;
-
-  case DYING:
-    return IPC_OK();
-
-  default:
-    NS_ERROR("Unexpected state");
-    return IPC_FAIL_NO_REASON(this);
-  }
-
-  mNPP->mNPNIface->destroystream(mNPP->mNPP, mStream, reason);
-  return IPC_OK();
-}
-
 void
 BrowserStreamParent::NPP_DestroyStream(NPReason reason)
 {
diff --git a/dom/plugins/ipc/BrowserStreamParent.h b/dom/plugins/ipc/BrowserStreamParent.h
index 141d8ac4dd62..435f98237434 100644
--- a/dom/plugins/ipc/BrowserStreamParent.h
+++ b/dom/plugins/ipc/BrowserStreamParent.h
@@ -33,8 +33,6 @@ public:
   virtual mozilla::ipc::IPCResult AnswerNPN_RequestRead(const IPCByteRanges& ranges,
                                                         NPError* result) override;
 
-  virtual mozilla::ipc::IPCResult RecvNPN_DestroyStream(const NPReason& reason) override;
-
   virtual mozilla::ipc::IPCResult RecvStreamDestroyed() override;
 
   int32_t WriteReady();
diff --git a/dom/plugins/ipc/PBrowserStream.ipdl b/dom/plugins/ipc/PBrowserStream.ipdl
index 8f5beedc522f..c4623a961d75 100644
--- a/dom/plugins/ipc/PBrowserStream.ipdl
+++ b/dom/plugins/ipc/PBrowserStream.ipdl
@@ -38,7 +38,6 @@ child:
 parent:
   intr NPN_RequestRead(IPCByteRanges ranges)
     returns (NPError result);
-  async NPN_DestroyStream(NPReason reason);
   async StreamDestroyed();
 
 /*