Add a QUIC proxy server to the list of QUIC servers supported at start up

net/websockets/websocket_end_to_end_test.cc

Index: net/websockets/websocket_end_to_end_test.cc
diff --git a/net/websockets/websocket_end_to_end_test.cc b/net/websockets/websocket_end_to_end_test.cc
index 31b557a07c1a6ec5c79129525590e840ee9ebbb6..a0a87e845dd8f023fde0d50e8b9e84965345bcee 100644
--- a/net/websockets/websocket_end_to_end_test.cc
+++ b/net/websockets/websocket_end_to_end_test.cc
@@ -240,6 +240,9 @@ class TestProxyDelegateWithProxyInfo : public ProxyDelegate {
       ProxyServer* alternative_proxy_server) const override {}
   void OnAlternativeProxyBroken(
       const ProxyServer& alternative_proxy_server) override {}
+  ProxyServer GetDefaultAlternativeProxy() const override {
+    return ProxyServer();
+  }
 
  private:
   ResolvedProxyInfo resolved_proxy_info_;