Fix syncing of NPAPI plugins.

This fix adds a check for |plugin| permission
while syncing NPAPI plugins.

BUG=252034

Review URL: https://chromiumcodereview.appspot.com/16816024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@207830 0039d316-1c4b-4281-b951-d872f2087c98
bool IsSyncableApp(const Extension* extension) {
  return GetSyncType(extension) == SYNC_TYPE_APP;
}

bool IsSyncableApp(const Extension* extension) {
  return GetSyncType(extension) == SYNC_TYPE_APP;
}
