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

apps/app_shim/test/app_shim_host_manager_test_api_mac.cc

Index: apps/app_shim/test/app_shim_host_manager_test_api_mac.cc
diff --git a/apps/app_shim/test/app_shim_host_manager_test_api_mac.cc b/apps/app_shim/test/app_shim_host_manager_test_api_mac.cc
index 2bd83fd87e3a0001f57f51342eb2886c0b2f142f..3028e93485a55ade0386e4231c68345bffabbfc8 100644
--- a/apps/app_shim/test/app_shim_host_manager_test_api_mac.cc
+++ b/apps/app_shim/test/app_shim_host_manager_test_api_mac.cc
@@ -9,14 +9,6 @@
 
 namespace test {
 
-// static
-void AppShimHostManagerTestApi::OverrideUserDataDir(
-    const base::FilePath& user_data_dir) {
-  CR_DEFINE_STATIC_LOCAL(base::FilePath, override_user_data_dir, ());
-  override_user_data_dir = user_data_dir;
-  AppShimHostManager::g_override_user_data_dir_ = &override_user_data_dir;
-}
-
 AppShimHostManagerTestApi::AppShimHostManagerTestApi(
     AppShimHostManager* host_manager)
     : host_manager_(host_manager) {