[Autofill] Remove closed TODO from PDM

Change-Id: I9639a8de500fc3aa12e95a9fdade8dfdab1cd4c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2610098Reviewed-by: Matthias Körber <koerber@google.com>
Commit-Queue: Vidhan Jain <vidhanj@google.com>
Cr-Commit-Position: refs/heads/master@{#840150}

components/autofill/core/browser/personal_data_manager.cc

@@ -551,8 +551,6 @@ void PersonalDataManager::OnAccountsCookieDeletedByUserAction() {
   ::autofill::prefs::ClearSyncTransportOptIns(pref_service_);
 }
 
-// TODO(crbug.com/903896): Generalize this to all the possible states relavant
-// to Autofill.
 AutofillSyncSigninState PersonalDataManager::GetSyncSigninState() const {
   // Check if the user is signed out.
   if (!sync_service_ || !identity_manager_ ||