[M85 Migration][Ubrowser] Ubrowser migration.

[M85 Migration][Ubrowser] Ubrowser migration.

In order to perform the browser test in m56 beta, we decided to
overwrite the Ubrowser codes to m56 beta from m47 beta.

This CL applies the Ubrowser source codes to m56 beta from
latest m47 beta source codes. However the source codes which related
to "TIZEN_VIDEO_MANUAL_ROTATION_SUPPORT" and "TIZEN_VD_TOMATO" flag
for specific product target were dropped in this CL. The dropped
features will be merged in migration of m47 patches.

ewk_view_widget_get API was introduced to help us with focusing issue.
However, it didn't resolve the issue, so our clients (email,
browser, crosswalk) decided to use the old solution aka "dummy button".

The only application that still uses ewk_view_widget_get API
is ubrowser. As the API has many side effects (e.g. select picker
and context menu do not display), we made a decision to remove
it from ubrowser too.

Refeirence:
https://review.tizen.org/gerrit/224961

Change-Id: I703969fb10ef90d94be95da4477823a5da403ee3
Signed-off-by: suyambu.rm <suyambu.rm@samsung.com>