[WinCE] Compile missing NetworkStorageSession methods
https://bugs.webkit.org/show_bug.cgi?id=110419

Patch by Mark Salisbury <mark.salisbury@hp.com> on 2013-04-05

* PlatformWinCE.cmake:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147834 268f45cc-cd09-0410-ab3c-d52691b4dbfc