[EFL] Fix failing WebKit1 API test of ewk_view_setting_tiled_backing_store
https://bugs.webkit.org/show_bug.cgi?id=126509

Reviewed by Gyuyoung Kim.

In WebKit1 EFL port, unit test was using a webview based on tiled backing store,
so ewk_view_setting_tiled_backing_store_enabled_set() was set as true as default.
As we do not need to use tiled backing store, we disable tiled backing store
and remove unnecessary EwkViewType in unit test webview.

* tests/UnitTestUtils/EWKTestView.cpp:
(EWKUnitTests::EWKTestView::init):
* tests/UnitTestUtils/EWKTestView.h:
* tests/test_ewk_view.cpp: Fix wrong comment in the unit test.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@161331 268f45cc-cd09-0410-ab3c-d52691b4dbfc