Put app shim IPC socket in a temporary directory. (Mac)

apps/app_shim/test/app_shim_host_manager_test_api_mac.h

 // Copyright 2013 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.
 
 #ifndef APPS_APP_SHIM_TEST_APP_SHIM_HOST_MANAGER_TEST_API_MAC_H
 #define APPS_APP_SHIM_TEST_APP_SHIM_HOST_MANAGER_TEST_API_MAC_H
 
 #include "base/basictypes.h"
 
 class AppShimHostManager;
 
 namespace base {
 class FilePath;
 }
 
 namespace IPC {
 class ChannelFactory;
 }
 
 namespace test {
 
 class AppShimHostManagerTestApi {
  public:
-  static void OverrideUserDataDir(const base::FilePath& user_data_dir);
-
   explicit AppShimHostManagerTestApi(AppShimHostManager* host_manager);
 
   IPC::ChannelFactory* factory();
 
+  const base::FilePath& directory_in_tmp();
+
  private:
   AppShimHostManager* host_manager_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(AppShimHostManagerTestApi);
 };
 
 }  // namespace test
 
 #endif  // APPS_APP_SHIM_TEST_APP_SHIM_HOST_MANAGER_TEST_API_MAC_H