Collect all ConnectionAttempts from both sockets in TransportConnectJob.

net/spdy/spdy_proxy_client_socket.cc

Index: net/spdy/spdy_proxy_client_socket.cc
diff --git a/net/spdy/spdy_proxy_client_socket.cc b/net/spdy/spdy_proxy_client_socket.cc
index 544b9a1ab50cef8919f643dc544c8596bcba7454..3f351b2c29be1aeb059c89a224d7378a208d5ca6 100644
--- a/net/spdy/spdy_proxy_client_socket.cc
+++ b/net/spdy/spdy_proxy_client_socket.cc
@@ -190,6 +190,11 @@ bool SpdyProxyClientSocket::GetSSLInfo(SSLInfo* ssl_info) {
                                   &protocol_negotiated);
 }
 
+void SpdyProxyClientSocket::GetConnectionAttempts(
+    ConnectionAttempts* out) const {
+  out->clear();
+}
+
 int SpdyProxyClientSocket::Read(IOBuffer* buf, int buf_len,
                                 const CompletionCallback& callback) {
   DCHECK(read_callback_.is_null());