Bug 814001, less surprising serializeToStream callback calls on content, r=bz

content/base/src/nsDocumentEncoder.cpp

@@ -1202,12 +1202,18 @@ nsDocumentEncoder::EncodeToStream(nsIOutputStream* aStream)
     NS_ENSURE_SUCCESS(rv, rv);
   }
 
-  mStream = aStream;
+  bool chromeCaller = nsContentUtils::IsCallerChrome();
-
+  if (chromeCaller) {
+    mStream = aStream;
+  }
   nsAutoString buf;
 
   rv = EncodeToString(buf);
 
+  if (!chromeCaller) {
+    mStream = aStream;
+  }
+
   // Force a flush of the last chunk of data.
   FlushText(buf, true);
 

content/base/src/nsXMLHttpRequest.cpp

@@ -2494,8 +2494,12 @@ GetRequestBody(nsIDOMDocument* aDoc, nsIInputStream** aResult,
   NS_ENSURE_SUCCESS(rv, rv);
 
   // Make sure to use the encoding we'll send
-  rv = serializer->SerializeToStream(aDoc, output, aCharset);
+  {
-  NS_ENSURE_SUCCESS(rv, rv);
+    nsCxPusher pusher;
+    pusher.PushNull();
+    rv = serializer->SerializeToStream(aDoc, output, aCharset);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
 
   output->Close();