Add libjingle_xmpp_unittests to Chromium bots.

third_party/libjingle_xmpp/run_all_unittests.cc

Index: third_party/libjingle_xmpp/run_all_unittests.cc
diff --git a/third_party/libjingle_xmpp/run_all_unittests.cc b/third_party/libjingle_xmpp/run_all_unittests.cc
deleted file mode 100644
index 49c887b9123e5290364ba2edbbf4be0e3b0b3d65..0000000000000000000000000000000000000000
--- a/third_party/libjingle_xmpp/run_all_unittests.cc
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright (c) 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "testing/gtest/include/gtest/gtest.h"
-
-int main(int argc, char* argv[]) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}