Removed empty files from the build
https://bugs.webkit.org/show_bug.cgi?id=113978

Reviewed by Anders Carlsson.

Anders made a list of all the empty files that are slowing down the Mac
build, and I grepped them away.

* WebCore.xcodeproj/project.pbxproj:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147686 268f45cc-cd09-0410-ab3c-d52691b4dbfc