Machine-local policy files should not affect tests

chrome/test/base/test_launcher_utils.cc

Index: chrome/test/base/test_launcher_utils.cc
diff --git a/chrome/test/base/test_launcher_utils.cc b/chrome/test/base/test_launcher_utils.cc
index 88926743500e693745885766a43a6d2aec508e4c..7dd5f9251b179a81f0fd104477e81d286edbbfb0 100644
--- a/chrome/test/base/test_launcher_utils.cc
+++ b/chrome/test/base/test_launcher_utils.cc
@@ -106,6 +106,12 @@ bool OverrideUserDataDir(const base::FilePath& user_data_dir) {
   // 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;