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<http://webkit.org/b/122190> WebKit2 APIs returning CF and NS types should explicitly declare whether they return retained objects.

This make the APIs easier to use under ARC and can help out the static analyzer.

Reviewed by Anders Carlsson.

* Shared/API/c/cf/WKErrorCF.h:
* Shared/API/c/cf/WKStringCF.h:
* Shared/API/c/cf/WKURLCF.h:
* Shared/API/c/cg/WKImageCG.h:
* Shared/API/c/mac/WKURLRequestNS.h:
* Shared/API/c/mac/WKURLResponseNS.h:
* UIProcess/API/C/cg/WKIconDatabaseCG.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@156743 268f45cc-cd09-0410-ab3c-d52691b4dbfc