Use AuthCredentials throughout the network stack instead of username/password.

net/spdy/spdy_proxy_client_socket_unittest.cc

Index: net/spdy/spdy_proxy_client_socket_unittest.cc
diff --git a/net/spdy/spdy_proxy_client_socket_unittest.cc b/net/spdy/spdy_proxy_client_socket_unittest.cc
index c54e9c778095250da0c1af2fbbe7313df121d527..1da1004e1771cfd47edf4111bf521888218637ad 100644
--- a/net/spdy/spdy_proxy_client_socket_unittest.cc
+++ b/net/spdy/spdy_proxy_client_socket_unittest.cc
@@ -89,8 +89,7 @@ class SpdyProxyClientSocketTest : public PlatformTest {
                                      "MyRealm1",
                                      HttpAuth::AUTH_SCHEME_BASIC,
                                      "Basic realm=MyRealm1",
-                                     kFoo,
-                                     kBar,
+                                     AuthCredentials(kFoo, kBar),
                                      "/");
   }