Explicitly declare Javascript vars when created, props projct, fixes #8654, fixes #8655, fixes #8656, for trunk

git-svn-id: https://develop.svn.wordpress.org/trunk@10232 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/js/common.js

@@ -1,5 +1,5 @@
 
-wpCookies = {
+var wpCookies = {
 // The following functions are from Cookie.js class in TinyMCE, Moxiecode, used under LGPL.
 
 	each : function(o, cb, s) {

wp-admin/js/editor.js

@@ -1,5 +1,5 @@
 
-switchEditors = {
+var switchEditors = {
 
 	mode : '',
 
@@ -169,4 +169,4 @@ switchEditors = {
 
 		return pee;
 	}
-}
+};

wp-includes/js/wp-ajax-response.js

@@ -1,4 +1,4 @@
-wpAjax = jQuery.extend( {
+var wpAjax = jQuery.extend( {
 	unserialize: function( s ) {
 		var r = {}; if ( !s ) { return r; }
 		var q = s.split('?'); if ( q[1] ) { s = q[1]; }