settings: Add async system salt retrieval logic in DeviceOAuth2TokenServiceFactory

chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos_unittest.cc

Index: chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos_unittest.cc
diff --git a/chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos_unittest.cc b/chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos_unittest.cc
index 4d321dc6515e5f44669d6d640150e435f5fa2fb7..eb02a0a21f83dfd4c7ef1a9107b28384346de9d2 100644
--- a/chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos_unittest.cc
+++ b/chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos_unittest.cc
@@ -108,10 +108,9 @@ class DeviceCloudPolicyManagerChromeOSTest
     TestingBrowserProcess::GetGlobal()->SetSystemRequestContext(
         request_context_getter_.get());
     TestingBrowserProcess::GetGlobal()->SetLocalState(&local_state_);
-    chromeos::DeviceOAuth2TokenServiceFactory::Initialize();
-    // This is needed as SystemSaltGetter is used for encrypting tokens in
-    // CryptohomeTokenEncryptor.
+    // SystemSaltGetter is used in DeviceOAuth2TokenServiceFactory.
     chromeos::SystemSaltGetter::Initialize();
+    chromeos::DeviceOAuth2TokenServiceFactory::Initialize();
     url_fetcher_response_code_ = 200;
     url_fetcher_response_string_ = "{\"access_token\":\"accessToken4Test\","
                                    "\"expires_in\":1234,"