[Sync] Cleanup all tab sync enabling logic now that its on by default.

BUG=none
TEST=


Review URL: https://chromiumcodereview.appspot.com/10443046

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@139462 0039d316-1c4b-4281-b951-d872f2087c98
syncable::ModelTypeSet ProfileSyncService::GetEncryptedDataTypes() const {
  DCHECK(encrypted_types_.Has(syncable::PASSWORDS));
  return encrypted_types_;
}

syncable::ModelTypeSet ProfileSyncService::GetEncryptedDataTypes() const {
  DCHECK(encrypted_types_.Has(syncable::PASSWORDS));
  return encrypted_types_;
}
