Collect all ConnectionAttempts from both sockets in TransportConnectJob.

net/server/http_server_unittest.cc

Index: net/server/http_server_unittest.cc
diff --git a/net/server/http_server_unittest.cc b/net/server/http_server_unittest.cc
index a6070e856d1ad72246e0c9bb56a1c5a572d2c372..c2426a31c26914d90180113fc17ecbd967850764 100644
--- a/net/server/http_server_unittest.cc
+++ b/net/server/http_server_unittest.cc
@@ -497,6 +497,11 @@ class MockStreamSocket : public StreamSocket {
   bool WasNpnNegotiated() const override { return false; }
   NextProto GetNegotiatedProtocol() const override { return kProtoUnknown; }
   bool GetSSLInfo(SSLInfo* ssl_info) override { return false; }
+  void GetConnectionAttempts(ConnectionAttempts* out) const override {
+    out->clear();
+  }
+  void ClearConnectionAttempts() override {}
+  void AddConnectionAttempts(const ConnectionAttempts& attempts) override {}
 
   // Socket
   int Read(IOBuffer* buf,