[EFL] Add command line option to MiniBrowser to set user agent
https://bugs.webkit.org/show_bug.cgi?id=116387

Patch by Jinwoo Song <jinwoo7.song@samsung.com> on 2013-05-19
Reviewed by Christophe Dumez.

We need this option to compare the rendering differences according to different user agents.

* MiniBrowser/efl/main.c:
(window_create):
(elm_main):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150357 268f45cc-cd09-0410-ab3c-d52691b4dbfc