Add StorageManager class to cmake ports

Unreviewed build fix. Though StorageManager was added to WK2 in r141024,
it is not added to cmake ports(EFL).

* CMakeLists.txt:
* PlatformEfl.cmake:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141032 268f45cc-cd09-0410-ab3c-d52691b4dbfc