Bug 1754913 - Intentionally ignore errors in FetchStreamReader::OnOutputStreamReader r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D138703

dom/fetch/FetchStreamReader.cpp

@@ -271,7 +271,7 @@ FetchStreamReader::OnOutputStreamReady(nsIAsyncOutputStream* aStream) {
   AutoEntryScript aes(mGlobal, "ReadableStreamReader.read", !mWorkerRef);
 
 #ifdef MOZ_DOM_STREAMS
-  ErrorResult rv;
+  IgnoredErrorResult rv;
 
   // The below very loosely tries to implement the incrementally-read-loop from
   // the fetch spec: However, because of the structure of the surrounding code,
@@ -292,10 +292,6 @@ FetchStreamReader::OnOutputStreamReady(nsIAsyncOutputStream* aStream) {
   ReadableStreamDefaultReaderRead(aes.cx(), MOZ_KnownLive(mReader), readRequest,
                                   rv);
 
-  // We report the (potential) JS Exception via the AutoEntryScript above, as
-  // was done in the JS Streams implementation as well.
-  rv.WouldReportJSException();
-
   if (NS_WARN_IF(rv.Failed())) {
     // Let's close the stream.
     CloseAndRelease(aes.cx(), NS_ERROR_DOM_INVALID_STATE_ERR);