settings: Make DeviceOAuth2TokenServiceFactory::Get() async

chrome/browser/chromeos/policy/enrollment_handler_chromeos.h

Index: chrome/browser/chromeos/policy/enrollment_handler_chromeos.h
diff --git a/chrome/browser/chromeos/policy/enrollment_handler_chromeos.h b/chrome/browser/chromeos/policy/enrollment_handler_chromeos.h
index 74b0fd17bc00b80386cbf9cc134c27f4bd3d802d..a8b996b4b2723cf73a04b71e2fe477866d9b04c4 100644
--- a/chrome/browser/chromeos/policy/enrollment_handler_chromeos.h
+++ b/chrome/browser/chromeos/policy/enrollment_handler_chromeos.h
@@ -23,6 +23,10 @@ namespace base {
 class SequencedTaskRunner;
 }
 
+namespace chromeos {
+class DeviceOAuth2TokenService;
+}
+
 namespace enterprise_management {
 class PolicyFetchResponse;
 }
@@ -142,6 +146,9 @@ class EnrollmentHandlerChromeOS : public CloudPolicyClient::Observer,
   // Reports the result of the enrollment process to the initiator.
   void ReportResult(EnrollmentStatus status);
 
+  // Continuation of OnStoreLoaded().
+  void DidGetTokenService(chromeos::DeviceOAuth2TokenService* token_service);
+
   DeviceCloudPolicyStoreChromeOS* store_;
   EnterpriseInstallAttributes* install_attributes_;
   scoped_ptr<CloudPolicyClient> client_;