AU: Ensure update_engine_client get proxy retries are spaced out in time.

Hopefully, this will reduce test flakyness. It seems that last time the test
failed all 4 tries happened within a one-second timeframe.

Also, fix GError object memory leaks throughout the code.

BUG=chromium-os:21351
TEST=unit tests, tested on VM

Change-Id: If0bc5d5767d12f3396d0fcb46f3e04ed6d7dfd5c
Reviewed-on: http://gerrit.chromium.org/gerrit/8862
Commit-Ready: Darin Petkov <petkov@chromium.org>
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Darin Petkov <petkov@chromium.org>
diff --git a/flimflam_proxy.cc b/flimflam_proxy.cc
index 27be084..4c1cfc9 100644
--- a/flimflam_proxy.cc
+++ b/flimflam_proxy.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+// Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -39,7 +39,7 @@
                                            &error);
   if (!proxy) {
     LOG(ERROR) << "Error getting FlimFlam proxy: "
-               << utils::GetGErrorMessage(error);
+               << utils::GetAndFreeGError(&error);
     return false;
   }
   *out_proxy = proxy;