Remove unused libjingle_xmpphelp target.

webrtc/libjingle/libjingle.gyp

-# Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
-#
-# Use of this source code is governed by a BSD-style license
-# that can be found in the LICENSE file in the root of the source
-# tree. An additional intellectual property rights grant can be found
-# in the file PATENTS.  All contributing project authors may
-# be found in the AUTHORS file in the root of the source tree.
-
-{
-  'includes': ['../build/common.gypi'],
-  'targets': [
-    {
-      'target_name': 'libjingle_xmpphelp',
-      'type': 'static_library',
-      'dependencies': [
-        '<(webrtc_root)/pc/pc.gyp:rtc_pc',
-      ],
-      'conditions': [
-        ['build_expat==1', {
-          'dependencies': [
-            '<(DEPTH)/third_party/expat/expat.gyp:expat',
-          ],
-        }],
-      ],
-      'sources': [
-        'xmpp/jingleinfotask.cc',
-        'xmpp/jingleinfotask.h',
-      ],
-    },  # target libjingle_xmpphelp
-  ],
-}