Fix Arc integration test.

chrome/browser/chromeos/profiles/profile_helper.h

Index: chrome/browser/chromeos/profiles/profile_helper.h
diff --git a/chrome/browser/chromeos/profiles/profile_helper.h b/chrome/browser/chromeos/profiles/profile_helper.h
index e987403d705bdece444121e1722ab6203d273768..691a6b0308a42e0c55b5c39a398c44949d898689 100644
--- a/chrome/browser/chromeos/profiles/profile_helper.h
+++ b/chrome/browser/chromeos/profiles/profile_helper.h
@@ -203,6 +203,9 @@ class ProfileHelper
   // Removes |account_id| user from |user_to_profile_for_testing_| for testing.
   void RemoveUserFromListForTesting(const AccountId& account_id);
 
+  // Clears all test account for testing.
+  void ClearUserToProfileMappingForTesting();
+
   // Identifies path to active user profile on Chrome OS.
   std::string active_user_id_hash_;