Changing naming of "method" to "mode" in error (very minor)

git-svn-id: http://svg-edit.googlecode.com/svn/trunk@2638 eee81c28-f429-11dd-99c0-75d572ba1ddd

editor/extensions/ext-webappfind.js

@@ -36,7 +36,7 @@ window.addEventListener('message', function(e) {
             alert('save complete for pathID ' + e.data[1] + '!');
             break;
         default:
-            throw 'Unexpected method';
+            throw 'Unexpected mode';
     }
 }, false);