Bug 1841242 - ObliviousHttpChannel::OnDataAvailable should accept multiple calls r=necko-reviewers,kershaw

Differential Revision: https://phabricator.services.mozilla.com/D182555

netwerk/protocol/http/ObliviousHttpChannel.cpp

@@ -659,9 +659,7 @@ ObliviousHttpChannel::OnDataAvailable(nsIRequest* aRequest,
       ("ObliviousHttpChannel::OnDataAvailable [this=%p, request=%p, stream=%p, "
        "offset=%" PRIu64 ", count=%u]",
        this, aRequest, aStream, aOffset, aCount));
-  if (aOffset != 0) {
-    return NS_ERROR_INVALID_ARG;
-  }
+  MOZ_ASSERT(aOffset == mRawResponse.Length());
   size_t oldLength = mRawResponse.Length();
   size_t newLength = oldLength + aCount;
   if (newLength < oldLength) {  // i.e., overflow