[usecase-webapi] Improve content usecase

- Scan complete to a pop up, not open in new page.
- Organize result to a table.
- Default show get Directory result.
- Update the button to "Open Dir".
- Fail Reason: DB connection error.

Impacted TCs num: New 0, Update 1, Delete 0
Unit test Platform: [Tizen-IVI]
Test result summary: Pass 0, Fail 1, Blocked 0
Merge remote-tracking branch 'upstream/master' into xujf/content/update
[webapi][XWALK-2253] Update the code format

Impacted TCs num(approved): New 0, Update 7, Delete 0
Unit test Platform: Andriod
Unit test result summary: Pass 6, Fail 1, Blocked 0