[Tizen][Runtime] Fix can not open a blocked navigation link in web
browser.

On Tizen common image, the MiniBrowser is invalid, so open a blocked
navigation link in a separate xwalk instead.

BUG=XWALK-1605
Merge pull request #1884 from takethathe/web-browser

[Tizen][Runtime] Fix can not open a blocked navigation link in web browser.