Mirror object for unresolved functions.
@param {string} value The name for the unresolved function reflected by this
mirror.
@constructor
@extends ObjectMirror
function UnresolvedFunctionMirror(value) {
  // Construct this using the ValueMirror as an unresolved function is not a
  // real object but just a string.
  %_Call(ValueMirror, this, MirrorType.FUNCTION_TYPE, value);
  this.propertyCount_ = 0;
  this.elementCount_ = 0;
  this.resolved_ = false;
}