refactor(CompileElement): remove unused methods

Closes angular#3500

Author: pkozlowski-opensource

modules/angular2/src/render/dom/compiler/compile_element.ts

@@ -50,17 +50,13 @@ export class CompileElement {
     return this.inheritedElementBinder;
   }
 
-  refreshAttrs() { this._attrs = null; }
-
   attrs(): Map<string, string> {
     if (isBlank(this._attrs)) {
       this._attrs = DOM.attributeMap(this.element);
     }
     return this._attrs;
   }
 
-  refreshClassList() { this._classList = null; }
-
   classList(): List<string> {
     if (isBlank(this._classList)) {
       this._classList = [];