Convert SigninTracker to use OAuth2TokenService notifications

chrome/browser/ui/sync/one_click_signin_helper.h

Index: chrome/browser/ui/sync/one_click_signin_helper.h
diff --git a/chrome/browser/ui/sync/one_click_signin_helper.h b/chrome/browser/ui/sync/one_click_signin_helper.h
index ea12c89003c7a6837dbd03710692eb529d755084..92e281bdb6e6a059e8798b0937463983d48488ef 100644
--- a/chrome/browser/ui/sync/one_click_signin_helper.h
+++ b/chrome/browser/ui/sync/one_click_signin_helper.h
@@ -219,6 +219,9 @@ class OneClickSigninHelper
   // TestingProfile provides.
   void SetDoNotClearPendingEmailForTesting();
 
+  // In unit tests, disable starting the actual sync.
+  void set_do_not_start_sync_for_testing();
+
   // Called when password has been submitted.
   void PasswordSubmitted(const autofill::PasswordForm& form);
 
@@ -276,6 +279,9 @@ class OneClickSigninHelper
   // pending e-mail.
   bool do_not_clear_pending_email_;
 
+  // Allows unittest to avoid starting sync for real.
+  bool do_not_start_sync_for_testing_;
+
   base::WeakPtrFactory<OneClickSigninHelper> weak_pointer_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OneClickSigninHelper);