Re-land: Defer SpdySession destruction to support closing writes

net/http/http_stream_factory_impl_job.cc

Index: net/http/http_stream_factory_impl_job.cc
diff --git a/net/http/http_stream_factory_impl_job.cc b/net/http/http_stream_factory_impl_job.cc
index 2dc5933e775c2652ad5b3cbc013cdbaff7d059b9..8c5531d246a18d2773a08293f186318935251f2d 100644
--- a/net/http/http_stream_factory_impl_job.cc
+++ b/net/http/http_stream_factory_impl_job.cc
@@ -346,6 +346,9 @@ void HttpStreamFactoryImpl::Job::OnNewSpdySessionReadyCallback() {
   // NULL at this point if the SpdySession closed immediately after creation.
   base::WeakPtr<SpdySession> spdy_session = new_spdy_session_;
   new_spdy_session_.reset();
+
+  // TODO(jgraettinger): Notify the factory, and let that notify |request_|,
+  // rather than notifying |request_| directly.
   if (IsOrphaned()) {
     if (spdy_session) {
       stream_factory_->OnNewSpdySessionReady(