Refactor AO2TS to make it easier to componentize.

chrome/browser/extensions/api/identity/identity_apitest.cc

Index: chrome/browser/extensions/api/identity/identity_apitest.cc
diff --git a/chrome/browser/extensions/api/identity/identity_apitest.cc b/chrome/browser/extensions/api/identity/identity_apitest.cc
index 0850b45a6cc83c8a00e241bfb887243d1fea39f9..93d8c8de0153b684f9c2f1d86a682dda206d7aea 100644
--- a/chrome/browser/extensions/api/identity/identity_apitest.cc
+++ b/chrome/browser/extensions/api/identity/identity_apitest.cc
@@ -591,7 +591,7 @@ class IdentityTestWithSignin : public AsyncExtensionBrowserTest {
 #else
     signin_manager_->SignIn(gaia, email, "password");
 #endif
-    token_service_->IssueRefreshTokenForUser(account_id, "refresh_token");
+    token_service_->UpdateCredentials(account_id, "refresh_token");
   }
 
   FakeSigninManagerForTesting* signin_manager_;
@@ -669,7 +669,7 @@ class GetAuthTokenFunctionTest : public IdentityTestWithSignin {
   }
 
   void IssueLoginRefreshTokenForAccount(const std::string account_key) {
-    token_service_->IssueRefreshTokenForUser(account_key, "refresh_token");
+    token_service_->UpdateCredentials(account_key, "refresh_token");
   }
 
   void IssueLoginAccessTokenForAccount(const std::string account_key) {