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 f406ec2609ecf7a8c276a671d7548d9454466261..3da25e5a41c36bc65f45963ef33f69f574e6edac 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) {