[Windows] Unreviewed VS2010 build correction after r143273.

* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj: Add missing source
file SourceProvider.cpp.
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters: Ditto.
* JavaScriptCore.vcxproj/JavaScriptCoreExportGenerator/JavaScriptCoreExports.def.in: Add missing exports.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143274 268f45cc-cd09-0410-ab3c-d52691b4dbfc