[WebKit] fatal error C1083: Cannot open include file: 'unicode/uchar.h'

Error Message:
fatal error C1083: Cannot open include file: 'unicode/uchar.h'

Solution:
Execute script update-webit and build-webkit again.

Reference:
http://hi.baidu.com/ksoftware/blog/item/75dace1f94750179f724e457.html