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

net/http/http_network_session.cc

Index: net/http/http_network_session.cc
diff --git a/net/http/http_network_session.cc b/net/http/http_network_session.cc
index 2936e12e5048e5b176db85fc7768bf0e4b7b697c..310253a79dc9418a410db42c1e98c917a7d6ce2b 100644
--- a/net/http/http_network_session.cc
+++ b/net/http/http_network_session.cc
@@ -144,6 +144,7 @@ HttpNetworkSession::HttpNetworkSession(const Params& params)
       http_auth_handler_factory_(params.http_auth_handler_factory),
       proxy_service_(params.proxy_service),
       ssl_config_service_(params.ssl_config_service),
+      push_delegate_(nullptr),
       quic_stream_factory_(
           params.net_log,
           params.host_resolver,
@@ -364,6 +365,15 @@ bool HttpNetworkSession::IsProtocolEnabled(NextProto protocol) const {
   return false;
 }
 
+void HttpNetworkSession::SetServerPushDelegate(
+    std::unique_ptr<ServerPushDelegate> push_delegate) {
+  DCHECK(!push_delegate_ && push_delegate);
+
+  push_delegate_ = std::move(push_delegate);
+  spdy_session_pool_.set_server_push_delegate(push_delegate_.get());
+  quic_stream_factory_.set_server_push_delegate(push_delegate_.get());
+}
+
 void HttpNetworkSession::GetAlpnProtos(NextProtoVector* alpn_protos) const {
   *alpn_protos = next_protos_;
 }