Send data back from service using IPC, not file.

cloud_print/cloud_print.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,
 
     'variables': {
       'version_py_path': '../tools/build/version.py',
       'version_path': 'VERSION',
@@ skipping 70 matching lines @@
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/base/base.gyp:run_all_unittests',
         '<(DEPTH)/base/base.gyp:test_support_base',
         '<(DEPTH)/testing/gmock.gyp:gmock',
         '<(DEPTH)/testing/gtest.gyp:gtest',
         'service/service.gyp:cloud_print_service_lib',
       ],
       'conditions': [
         ['OS=="win"', {
           'sources': [
+            'service/win/service_ipc_unittest.cc',
             'virtual_driver/win/port_monitor/port_monitor_unittest.cc',
           ],
           'dependencies': [
             'virtual_driver/win/virtual_driver.gyp:gcp_portmon_lib',
           ],
         }],
       ],
+      'msvs_settings': {
+        'VCLinkerTool': {
+          'AdditionalDependencies': [
+              'secur32.lib',
+          ],
+        },
+      },
     },
   ],
 }