Fix suspicious code detected by closure compiler.

ui/file_manager/file_manager/common/js/util.js

Index: ui/file_manager/file_manager/common/js/util.js
diff --git a/ui/file_manager/file_manager/common/js/util.js b/ui/file_manager/file_manager/common/js/util.js
index e6dbe422996e213a57a3f01c3be9e7651aae13e3..02620223076f1a782f543a55f66ffab5ef3e889d 100644
--- a/ui/file_manager/file_manager/common/js/util.js
+++ b/ui/file_manager/file_manager/common/js/util.js
@@ -460,7 +460,7 @@ util.AppCache.cleanup_ = function(map) {
     if (map.hasOwnProperty(key))
       keys.push(key);
   }
-  keys.sort(function(a, b) { return map[a].expire > map[b].expire; });
+  keys.sort(function(a, b) { return map[a].expire - map[b].expire; });
 
   var cutoff = Date.now();
 
@@ -495,7 +495,9 @@ util.loadImage = function(image, url, opt_options, opt_isValid) {
                                        image,
                                        opt_options || {},
                                        function() {},
-                                       function() { image.onerror(); },
+                                       function() {
+                                         image.onerror(new Event('load-error'));
+                                       },
                                        opt_isValid);
 };