[Windows] Unreviewed VS2010 build correction.

* WebKit.vcxproj/WebKitExportGenerator/WebKitExports.def.in: Sync
export definition with VS2005 version.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143278 268f45cc-cd09-0410-ab3c-d52691b4dbfc