[EFL] Change the behavior of ewk_view_scale_set.
https://bugs.webkit.org/show_bug.cgi?id=70078

Reviewed by Eric Seidel.

Remove center point basis zoom alignment from ewk_view_scale_set to call
Page::setPageScaleFactor without any adjustment.

* ewk/ewk_view.cpp:
(ewk_view_scale_set):
* ewk/ewk_view.h:


git-svn-id: svn://svn.chromium.org/blink/trunk@103288 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Eina_Bool ewk_view_back(Evas_Object* ewkView)
{
    EWK_VIEW_SD_GET_OR_RETURN(ewkView, smartData, false);
    return ewk_frame_back(smartData->main_frame);
}

Eina_Bool ewk_view_back(Evas_Object* ewkView)
{
    EWK_VIEW_SD_GET_OR_RETURN(ewkView, smartData, false);
    return ewk_frame_back(smartData->main_frame);
}
