Prevent invalidating refresh token on transient errors.

chrome/browser/sync/profile_sync_service.cc

Index: chrome/browser/sync/profile_sync_service.cc
diff --git a/chrome/browser/sync/profile_sync_service.cc b/chrome/browser/sync/profile_sync_service.cc
index 955a4b6eb90c57232cd69c6f1f22a15fef2fbb48..07691854c374e3602534b4e182e54a0a10ec3e06 100644
--- a/chrome/browser/sync/profile_sync_service.cc
+++ b/chrome/browser/sync/profile_sync_service.cc
@@ -761,6 +761,8 @@ void ProfileSyncService::OnGetTokenFailure(
   last_get_token_error_ = error;
   switch (error.state()) {
     case GoogleServiceAuthError::CONNECTION_FAILED:
+    case GoogleServiceAuthError::REQUEST_CANCELED:
+    case GoogleServiceAuthError::SERVICE_ERROR:
     case GoogleServiceAuthError::SERVICE_UNAVAILABLE: {
       // Transient error. Retry after some time.
       request_access_token_backoff_.InformOfRequest(false);
@@ -774,7 +776,6 @@ void ProfileSyncService::OnGetTokenFailure(
       NotifyObservers();
       break;
     }
-    case GoogleServiceAuthError::SERVICE_ERROR:
     case GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS: {
       if (!sync_prefs_.SyncHasAuthError()) {
         sync_prefs_.SetSyncAuthError(true);
@@ -785,6 +786,9 @@ void ProfileSyncService::OnGetTokenFailure(
       // Fallthrough.
     }
     default: {
+      if (error.state() != GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS) {
+        LOG(ERROR) << "Unexpected persistent error: " << error.ToString();
+      }
       // Show error to user.
       UpdateAuthErrorState(error);
     }