Deprecate instead of close SPDY sessions upon network change.

net/spdy/spdy_session.h

Index: net/spdy/spdy_session.h
diff --git a/net/spdy/spdy_session.h b/net/spdy/spdy_session.h
index fde42024be8f54291338e01b246d797af7212f7c..fd8cdc1bd083086660e25da8a3257eab9433a0a1 100644
--- a/net/spdy/spdy_session.h
+++ b/net/spdy/spdy_session.h
@@ -353,6 +353,11 @@ class NET_EXPORT SpdySession : public BufferedSpdyFramerVisitorInterface,
   // |description| indicates the reason for the error.
   void CloseSessionOnError(Error err, const std::string& description);
 
+  // Mark this session as going away. It will not be used to service new

[akalin, 2014/01/29 23:26:18]

I think the following is better wording:

// Mark this session as unavailable, meaning that it will not be used to service
new streams. Unlike when a GOAWAY frame is received, this function will not
close any streams.

+  // streams. This only changes the session's availability but does not
+  // actively close streams as StartGoingAway() does.
+  void MakeUnavailable();
+
   // Retrieves information on the current state of the SPDY session as a
   // Value.  Caller takes possession of the returned value.
   base::Value* GetInfoAsValue() const;