@Override
            protected Void doInBackground(Void... voids) {
                SharedPreferences.Editor editor = getPreferences(context).edit();
                editor.putString(PREFS_VERIFIED_PROVIDER, providerEmptyChecked);
                editor.apply();
                return null;
            }
Sets (asynchronously) the package that this service will accept connections from.
@param context A context to be used to access SharedPreferences.
@param provider The package of the provider to accept connections from or null to clear.
@hide
customtabs/src/android/support/customtabs/trusted/TrustedWebActivityService.java