function valueOf(maybeTrusted) {
      if (maybeTrusted instanceof trustedValueHolderBase) {
        return maybeTrusted.$$unwrapTrustedValue();
      } else {
        return maybeTrusted;
      }
    }
@ngdoc method
@name $sceDelegate#valueOf

@description
If the passed parameter had been returned by a prior call to {@link ng.$sceDelegate#trustAs
`$sceDelegate.trustAs`}, returns the value that had been passed to {@link
ng.$sceDelegate#trustAs `$sceDelegate.trustAs`}.

If the passed parameter is not a value that had been returned by {@link
ng.$sceDelegate#trustAs `$sceDelegate.trustAs`}, it must be returned as-is.

@param {*} value The result of a prior {@link ng.$sceDelegate#trustAs `$sceDelegate.trustAs`}
    call or anything else.
@return {*} The `value` that was originally provided to {@link ng.$sceDelegate#trustAs
    `$sceDelegate.trustAs`} if `value` is the result of such a call.  Otherwise, returns
    `value` unchanged.