use call() for better performance

call() performance twice as better than apply()

http://jsperf.com/call-apply-segu
Use ViewUtils.getFileEntryDisplay() on creating new file

On creation of a file item, make sure we use
ViewUtils.getFileEntryDisplay() to set the right extension styles.
Merge pull request #3690 from rajeshsegu/extension

Issue #3679 - File extension now dimmed if created via File > New