QUIC - fix crash when writing part of the request body fails

net/quic/quic_http_stream.cc

Index: net/quic/quic_http_stream.cc
diff --git a/net/quic/quic_http_stream.cc b/net/quic/quic_http_stream.cc
index 20d1e365e761de486c627d40cc51baafcd9c4bf0..81b57f8f42827b4514489906ba18b2aaa26844f6 100644
--- a/net/quic/quic_http_stream.cc
+++ b/net/quic/quic_http_stream.cc
@@ -471,6 +471,10 @@ int QuicHttpStream::DoReadRequestBodyComplete(int rv) {
   if (rv < 0)
     return rv;
 
+  // If the stream is already closed, don't continue.
+  if (!stream_)
+    return response_status_;
+
   request_body_buf_ = new DrainableIOBuffer(raw_request_body_buf_.get(), rv);
   if (rv == 0) {  // Reached the end.
     DCHECK(request_body_stream_->IsEOF());
@@ -504,6 +508,10 @@ int QuicHttpStream::DoSendBodyComplete(int rv) {
   if (rv < 0)
     return rv;
 
+  // If the stream is already closed, don't continue.
+  if (!stream_)
+    return response_status_;
+
   request_body_buf_->DidConsume(request_body_buf_->BytesRemaining());
 
   if (!request_body_stream_->IsEOF()) {