Machine-local policy files should not affect tests

chrome/test/base/test_launcher_utils.cc

 // 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.
 
 #include "chrome/test/base/test_launcher_utils.h"
 
 #include <memory>
 
 #include "base/command_line.h"
 #include "base/environment.h"
@@ skipping 88 matching lines @@
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
   // Make sure the cache directory is inside our clear profile. Otherwise
   // the cache may contain data from earlier tests that could break the
   // current test.
   //
   // Note: we use an environment variable here, because we have to pass the
   // value to the child process. This is the simplest way to do it.
   std::unique_ptr<base::Environment> env(base::Environment::Create());
   success = success && env->SetVar("XDG_CACHE_HOME", user_data_dir.value());
+
+  // Also make sure that the machine policy directory is inside the clear
+  // profile. Otherwise the machine's policies could affect tests.
+  base::FilePath policy_files = user_data_dir.AppendASCII("policies");
+  success =
+      success && PathService::Override(chrome::DIR_POLICY_FILES, policy_files);
 #endif
 
   return success;
 }
 
 }  // namespace test_launcher_utils