Revert "Fix IE leaks caused by ._fireEvent circular reference"

This reverts commit 4c68d39.

Source/Element/Element.js

@@ -800,20 +800,18 @@ var formProps = {input: 'checked', option: 'selected', textarea: 'value'};
 Element.implement({
 
 	destroy: function(){
-        if(! this.getElementsByTagName) return null; //textNode
 		var children = clean(this).getElementsByTagName('*');
 		Array.each(children, clean);
 		Element.dispose(this);
 		return null;
 	},
 
 	empty: function(){
-		Array.from(this.childNodes).each(Element.destroy);
+		Array.from(this.childNodes).each(Element.dispose);
 		return this;
 	},
 
 	dispose: function(){
-        this._fireEvent = null;
 		return (this.parentNode) ? this.parentNode.removeChild(this) : this;
 	},
 
@@ -951,13 +949,6 @@ Element.Properties.html = {
 
 };
 
-// fix for IE leak on Element.set('text','')
-Element.Properties.text = {
-    set: function(text){
-        Element.prototype.empty.call(this).setProperty('text',text);
-    }
-}
-
 var supportsHTML5Elements, supportsTableInnerHTML, supportsTRInnerHTML;
 
 /*<ltIE9>*/