[Sync] Move 'sync_listen_notifications' target to sync/tools

sync/sync.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     # The core sync library.
@@ skipping 451 matching lines @@
       # leak_annotations.h, which pulls this in.  Make 'base'
       # propagate this dependency.
       'conditions': [
         ['OS=="linux" and linux_use_tcmalloc==1', {
           'dependencies': [
             '../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
     },
+
+    # A tool to listen to sync notifications and print them out.
+    {
+      'target_name': 'sync_listen_notifications',
+      'type': 'executable',
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../jingle/jingle.gyp:notifier',
+        '../net/net.gyp:net',
+        '../net/net.gyp:net_test_support',
+        'sync',
+        'sync_notifier',
+      ],
+      'sources': [
+        'tools/sync_listen_notifications.cc',
+      ],
+    },
   ],
 }