uBrowser: Refactor extra actions menu to use Elementary ctxpopup

uBrowser: Refactor extra actions menu to use Elementary ctxpopup

Unfortunately the previous elementary menu object did not work correctly
on 2.4 targets. It was shown, but with an transparent background making
it difficult to use. This patch changes uBrowser to use elementary
ctxpopup widget as the basis of extra actions menu. This widget is
rendered properly all currently supported platforms.

While at this the patch also changes the menu options a bit. On the
refactoring branch stuff like zoom in/out does work on desktop so the patch
exposes it there. Since window resizing is also much more reliable, menu options
for resizing windows are not longer needed.

Change-Id: Ibf09267a81854b5e49f17fa79ba827275459246f
Signed-off-by: Piotr Tworek <p.tworek@samsung.com>