Server push cancellation: change the ownership of ServerPushDelegate to HttpNetworkSession.

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 b7066bc8c0bddf1112a68a314fe93506ab718317..c97461df62a7ec5f8d0675ea398cf58a72a27df9 100644
--- a/net/spdy/spdy_session.h
+++ b/net/spdy/spdy_session.h
@@ -301,6 +301,7 @@ class NET_EXPORT SpdySession : public BufferedSpdyFramerVisitorInterface,
               size_t session_max_recv_window_size,
               size_t stream_max_recv_window_size,
               TimeFunc time_func,
+              ServerPushDelegate* push_delegate,
               ProxyDelegate* proxy_delegate,
               NetLog* net_log);
 
@@ -327,10 +328,6 @@ class NET_EXPORT SpdySession : public BufferedSpdyFramerVisitorInterface,
                     base::WeakPtr<SpdyStream>* spdy_stream,
                     const NetLogWithSource& stream_net_log);
 
-  void set_push_delegate(ServerPushDelegate* push_delegate) {
-    push_delegate_ = push_delegate;
-  }
-
   // Called when the pushed stream should be cancelled. If the pushed stream is
   // not claimed and active, sends RST to the server to cancel the stream.
   void CancelPush(const GURL& url);