[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
void ProfileSyncService::ChangePreferredDataTypes(
    syncable::ModelTypeSet preferred_types) {

  DVLOG(1) << "ChangePreferredDataTypes invoked";
  const syncable::ModelTypeSet registered_types = GetRegisteredDataTypes();
  const syncable::ModelTypeSet registered_preferred_types =
      Intersection(registered_types, preferred_types);
  sync_prefs_.SetPreferredDataTypes(registered_types,
                                    registered_preferred_types);

  ReconfigureDatatypeManager();
}

void ProfileSyncService::ChangePreferredDataTypes(
    syncable::ModelTypeSet preferred_types) {

  DVLOG(1) << "ChangePreferredDataTypes invoked";
  const syncable::ModelTypeSet registered_types = GetRegisteredDataTypes();
  const syncable::ModelTypeSet registered_preferred_types =
      Intersection(registered_types, preferred_types);
  sync_prefs_.SetPreferredDataTypes(registered_types,
                                    registered_preferred_types);

  ReconfigureDatatypeManager();
}
