[M34-Merge] Rename ewk_context_form_candidate_data_clear() to ewk_context_form_candidate_data_delete_all()
API was changed in webkit-efl, and this is a chromium-efl catch up.
This is also reflected in the browser side, as per commit
deab57b0 (by junghwan.kang).
Original work: http://165.213.202.130:8080/#/c/70014/
Bug: http://107.108.218.239/bugzilla/show_bug.cgi?id=8496
Reviewed by: Kamil Klimek, SeungSeop Park
Change-Id: Id70ef37703d888da2290a136e481cc9dd87a3a25
Signed-off-by: Antonio Gomes <a1.gomes@samsung.com>