Fix example to use new selection API. Squash lwc string leak
Fix example to use new selection API.
Squash lwc string leak

svn path=/trunk/libcss/; revision=11212

servo/libcss,zhuyadong/libcss,servo/libcss,servo/libcss,prepare/netsurf_libcss,prepare/netsurf_libcss,prepare/netsurf_libcss,zhuyadong/libcss,zhuyadong/libcss