[EFL][WK2] build fix after r148434
https://bugs.webkit.org/show_bug.cgi?id=114647

Patch by Seokju Kwon <seokju.kwon@gmail.com> on 2013-04-15
Reviewed by Benjamin Poulain.

* UIProcess/API/efl/EwkView.cpp:
(EwkView::showContextMenu):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148477 268f45cc-cd09-0410-ab3c-d52691b4dbfc