Collect all ConnectionAttempts from both sockets in TransportConnectJob.

net/socket/unix_domain_client_socket_posix.cc

Index: net/socket/unix_domain_client_socket_posix.cc
diff --git a/net/socket/unix_domain_client_socket_posix.cc b/net/socket/unix_domain_client_socket_posix.cc
index 70ad42baa0ec3af2d92053c47efd059b553850a3..79aa275bf4b0da1039bae3149e4035db689d1ef3 100644
--- a/net/socket/unix_domain_client_socket_posix.cc
+++ b/net/socket/unix_domain_client_socket_posix.cc
@@ -150,6 +150,11 @@ bool UnixDomainClientSocket::GetSSLInfo(SSLInfo* ssl_info) {
   return false;
 }
 
+void UnixDomainClientSocket::GetConnectionAttempts(
+    ConnectionAttempts* out) const {
+  out->clear();
+}
+
 int UnixDomainClientSocket::Read(IOBuffer* buf, int buf_len,
                                  const CompletionCallback& callback) {
   DCHECK(socket_);