Move WebMediaPlayerEfl from media to content_renderer

Move WebMediaPlayerEfl from media to content_renderer

Component build was failed when trying to link libmedia,
because WebMediaPlayerEfl needs libcontent.
If we add libcontent as a dependency in gyp to resolve link error,
it may result in cyclic dependency.
To avoid dependency on libcontent, WebMediaPlayerEfl should be
moved to content_renderer.
Please refer to the android's implementation(WebMediaPlayerAndroid).

Bug: http://107.108.218.239/bugzilla/show_bug.cgi?id=13303
Reviewed by: Antonio Gomes, SeungSeop Park, Venugopal S M

Change-Id: Id1ab83e5f5d5712061355c49a3d9f63de144967c
Signed-off-by: yh106.jung <yh106.jung@samsung.com>