Deprecate instead of close SPDY sessions upon network change.

net/spdy/spdy_session.cc

Index: net/spdy/spdy_session.cc
diff --git a/net/spdy/spdy_session.cc b/net/spdy/spdy_session.cc
index 9508f0e6af47da6326ecb732c14bdd86e3a4d314..ff45287028a45c683bbd6c541d2e97826e510824 100644
--- a/net/spdy/spdy_session.cc
+++ b/net/spdy/spdy_session.cc
@@ -2285,6 +2285,10 @@ void SpdySession::OnGoAway(SpdyStreamId last_accepted_stream_id,
                  active_streams_.size(),
                  unclaimed_pushed_streams_.size(),
                  status));
+  GoAway(last_accepted_stream_id, ERR_ABORTED);
+}
+
+void SpdySession::GoAway(SpdyStreamId last_accepted_stream_id, Error err) {
   if (availability_state_ < STATE_GOING_AWAY) {
     availability_state_ = STATE_GOING_AWAY;
     // |pool_| will be NULL when |InitializeWithSocket()| is in the
@@ -2292,7 +2296,7 @@ void SpdySession::OnGoAway(SpdyStreamId last_accepted_stream_id,
     if (pool_)
       pool_->MakeSessionUnavailable(GetWeakPtr());
   }
-  StartGoingAway(last_accepted_stream_id, ERR_ABORTED);
+  StartGoingAway(last_accepted_stream_id, err);
   // This is to handle the case when we already don't have any active
   // streams (i.e., StartGoingAway() did nothing). Otherwise, we have
   // active streams and so the last one being closed will finish the
@@ -2300,6 +2304,13 @@ void SpdySession::OnGoAway(SpdyStreamId last_accepted_stream_id,
   MaybeFinishGoingAway();
 }
 
+void SpdySession::Deprecate(Error err) {
+  SpdyStreamId highest_active_stream_id = 0;
+  if (active_streams_.size())
+    highest_active_stream_id = active_streams_.rbegin()->first;
+  GoAway(highest_active_stream_id, err);
+}
+
 void SpdySession::OnPing(uint32 unique_id) {
   CHECK(in_io_loop_);