XPCReadableJSStringWrapper() : nsDependentString(char_traits::sEmptyBuffer, char_traits::sEmptyBuffer) { SetIsVoid(PR_TRUE); }
XPCReadableJSStringWrapper(PRUnichar *chars, size_t length) : nsDependentString(chars, length) { }
    XPCReadableJSStringWrapper() :        nsDependentString(char_traits::sEmptyBuffer, char_traits::sEmptyBuffer)    { SetIsVoid(PR_TRUE); }