Cannot run All Source (target WebProcess) on Xcode.
https://bugs.webkit.org/show_bug.cgi?id=111042

Patch by Yuki Sekiguchi <yuki.sekiguchi@access-company.com> on 2013-03-22
Reviewed by Alexey Proskuryakov.

WebProcessShim is renamed by r139066.
However, WebProcessShim is not renamed to SecItemShim in WebKit.xcworkspace.
This make WebProcess.app load WebProcessShim.dylib, and it cause dyld loading error.

* WebKit.xcworkspace/xcshareddata/xcschemes/All Source (target WebProcess).xcscheme: Renamed WebProcessShim to SecItemShim.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146586 268f45cc-cd09-0410-ab3c-d52691b4dbfc