Files.app: Let MetadataCacheModel use cached URLs.

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 821407c8ef4e6a7573800591e85f25f13fb26d89..ff3428378107d5b70569dd31a0dc58bea812452e 100644
--- a/ui/file_manager/file_manager/common/js/util.js
+++ b/ui/file_manager/file_manager/common/js/util.js
@@ -767,7 +767,10 @@ util.getCurrentLocaleOrDefault = function() {
  */
 util.entriesToURLs = function(entries) {
   return entries.map(function(entry) {
-    return entry.toURL();
+    // When building background.js, cachedUrl is not refered other than here.
+    // Thus closure compiler raises an error if we refer the property like
+    // entry.cachedUrl.
+    return entry['cachedUrl'] || entry.toURL();
   });
 };