Revert of Server push cancellation: add a finch trial parameter (patchset #14 id:280001 of https://…

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 54fe15936aae01334451793d747091027b35a6eb..b57653a3b77aea99af3d6904e8f0ee6f2e0a37fd 100644
--- a/net/http/http_network_session.cc
+++ b/net/http/http_network_session.cc
@@ -398,9 +398,7 @@ bool HttpNetworkSession::IsProtocolEnabled(NextProto protocol) const {
 
 void HttpNetworkSession::SetServerPushDelegate(
     std::unique_ptr<ServerPushDelegate> push_delegate) {
-  DCHECK(push_delegate);
-  if (!params_.enable_server_push_cancellation || push_delegate_)
-    return;
+  DCHECK(!push_delegate_ && push_delegate);
 
   push_delegate_ = std::move(push_delegate);
   spdy_session_pool_.set_server_push_delegate(push_delegate_.get());