[EFL] Change format of return value of navigator.language

[EFL] Change format of return value of navigator.language
https://bugs.webkit.org/show_bug.cgi?id=89639

Patch by Kihong Kwon <kihong.kwon@samsung.com> on 2012-07-04
Reviewed by Kenneth Rohde Christiansen.

Source/WebCore:

Remove encoding type from return value of navigator.language.
For example, from en-US.UTF-8 to en-US.

Use exist test case (fast/js/navigator-language.html).

* platform/efl/LanguageEfl.cpp:
(WebCore::platformLanguage):

LayoutTests:

* platform/efl/TestExpectations: Remove fast/js/navigator-language.html

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121833 268f45cc-cd09-0410-ab3c-d52691b4dbfc