LegacyElementMixin to @unrestricted

Author: Steven Orvell

closure.log

@@ -705,7 +705,7 @@ Found    : PolymerElement
     !(window.customElements.polyfillWrapFlushCallback);
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-/polymer.html_script_22.js:857: WARNING - Function this.splice: called with 3 argument(s). Function requires at least 4 argument(s) and at most 4.
+/polymer.html_script_22.js:853: WARNING - Function this.splice: called with 3 argument(s). Function requires at least 4 argument(s) and at most 4.
             return this.splice(arrayOrPath, index, 1);
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 

lib/legacy/legacy-element-mixin.html

@@ -62,17 +62,13 @@
     /**
      * @polymerMixinClass
      * @implements {Polymer_LegacyElementMixin}
+     * @unrestricted
      */
     class LegacyElement extends legacyElementBase {
 
       constructor() {
         super();
         this.root = this;
-        // initialize for closure but don't make false or a binding will see
-        // this setting.
-        this.isAttached = undefined;
-        this.__boundListeners = null;
-        this._debouncers = null;
         this.created();
       }