fix(button): remove ref to Event global (for node)

Author: jelbourn

src/components/button/button.ts

@@ -22,7 +22,7 @@ import {
     '[class.md-button-focus]': 'isKeyboardFocused',
     '(mousedown)': 'setMousedown()',
     '(focus)': 'setKeyboardFocus()',
-    '(blur)': 'removeKeyboardFocus()'
+    '(blur)': 'removeKeyboardFocus()',
   },
   templateUrl: './components/button/button.html',
   styleUrls: ['./components/button/button.css'],
@@ -85,7 +85,8 @@ export class MdButton {
     '[class.md-button-focus]': 'isKeyboardFocused',
     '(mousedown)': 'setMousedown()',
     '(focus)': 'setKeyboardFocus()',
-    '(blur)': 'removeKeyboardFocus()'
+    '(blur)': 'removeKeyboardFocus()',
+    '(click)': 'haltDisabledEvents($event)',
   },
   templateUrl: './components/button/button.html',
   styleUrls: ['./components/button/button.css'],
@@ -118,7 +119,6 @@ export class MdAnchor extends MdButton {
     this._disabled = (value != null && value != false) ? true : null;
   }
 
-  @HostListener('click', ['$event'])
   haltDisabledEvents(event: Event) {
     // A disabled button shouldn't apply any actions
     if (this.disabled) {