[webkit-efl] I'd like to refactor zoom related APIs.

[Ryuan Choi]

You can see history in https://bugs.webkit.org/show_bug.cgi?id=62842

In a short, 
I'd like to introduce scalePage feature of webkit.
But, current ewk_{frame|view}_zoom_{get|set} is not good to expand.

So, I'd like to change zoom related APIs like gustavo mentioned.
1) remove last two argument(center position) of ewk_view_zoom_set.
2) remove ewk_{view|frame}_text_only_{get|set}
3) introduce ewk_{view|frame}_text_zoom_{get|set}, ewk_view_scale_{get|set}
ewk_tiled_backingstore will use ewk_view_scale_set instead of ewk_view_zoom_set.

please visit at https://bugs.webkit.org/show_bug.cgi?id=62842 if you want to see changes.

Best Regards,
Ryuan Choi

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