Collect all ConnectionAttempts from both sockets in TransportConnectJob.

net/http/http_proxy_client_socket.cc

Index: net/http/http_proxy_client_socket.cc
diff --git a/net/http/http_proxy_client_socket.cc b/net/http/http_proxy_client_socket.cc
index 2eec09c8bb34dfbfb569217d1c6456cb05d4bf6a..2f0619b085ea2a9c53d4467b42f40f744e1c43f2 100644
--- a/net/http/http_proxy_client_socket.cc
+++ b/net/http/http_proxy_client_socket.cc
@@ -213,6 +213,11 @@ bool HttpProxyClientSocket::GetSSLInfo(SSLInfo* ssl_info) {
   return false;
 }
 
+void HttpProxyClientSocket::GetConnectionAttempts(
+    ConnectionAttempts* out) const {
+  out->clear();
+}
+
 int HttpProxyClientSocket::Read(IOBuffer* buf, int buf_len,
                                 const CompletionCallback& callback) {
   DCHECK(user_callback_.is_null());