Update types.

externs/closure-types.js

@@ -886,10 +886,6 @@ Polymer_ElementMixin._finalizeClass = function(){};
 */
 Polymer_ElementMixin.createObservers = function(observers, dynamicFns){};
 /**
-* @return {!HTMLTemplateElement}
-*/
-Polymer_ElementMixin._getTemplateFromDomModule = function(){};
-/**
 * @param {string} cssText Text containing styling to process
 * @param {string} baseURI Base URI to rebase CSS paths against
 * @return {string}

types/lib/mixins/element-mixin.d.ts

@@ -113,14 +113,6 @@ declare namespace Polymer {
      */
     createObservers(observers: object|null, dynamicFns: object|null): void;
 
-    /**
-     * Look up template from dom-module for element
-     *
-     * @returns Template found in dom module, or
-     *   undefined if not found
-     */
-    _getTemplateFromDomModule(): HTMLTemplateElement;
-
     /**
      * Gather style text for a style element in the template.
      *