Refactor AO2TS to make it easier to componentize.

google_apis/gaia/account_tracker_unittest.cc

Index: google_apis/gaia/account_tracker_unittest.cc
diff --git a/google_apis/gaia/account_tracker_unittest.cc b/google_apis/gaia/account_tracker_unittest.cc
index 61fded91a1ad6689022140f189ad7fc5b4a990b4..bec0ec6cc291e4d7f735e682d4cc2a946f5fe109 100644
--- a/google_apis/gaia/account_tracker_unittest.cc
+++ b/google_apis/gaia/account_tracker_unittest.cc
@@ -301,11 +301,12 @@ class IdentityAccountTrackerTest : public testing::Test {
   void NotifyLogout() { identity_provider()->LogOut(); }
 
   void NotifyTokenAvailable(const std::string& username) {
-    fake_oauth2_token_service_->AddAccount(username);
+    fake_oauth2_token_service_->GetDelegate()->UpdateCredentials(
+        username, "refresh_token");
   }
 
   void NotifyTokenRevoked(const std::string& username) {
-    fake_oauth2_token_service_->RemoveAccount(username);
+    fake_oauth2_token_service_->GetDelegate()->RevokeCredentials(username);
   }
 
   // Helpers to fake access token and user info fetching