Update from https://crrev.com/305340

net/proxy/network_delegate_error_observer_unittest.cc

Index: net/proxy/network_delegate_error_observer_unittest.cc
diff --git a/net/proxy/network_delegate_error_observer_unittest.cc b/net/proxy/network_delegate_error_observer_unittest.cc
index 5d2c501e0581dbab0495e9985465131807db89c4..da87f8d9f3d4e0df65b313972ff288fd7b2f9c77 100644
--- a/net/proxy/network_delegate_error_observer_unittest.cc
+++ b/net/proxy/network_delegate_error_observer_unittest.cc
@@ -77,10 +77,6 @@ class TestNetworkDelegate : public net::NetworkDelegate {
   bool OnCanThrottleRequest(const URLRequest& request) const override {
     return false;
   }
-  int OnBeforeSocketStreamConnect(SocketStream* stream,
-                                  const CompletionCallback& callback) override {
-    return OK;
-  }
 
   bool got_pac_error_;
 };