Fixed: <rdar://problem/3880410> save 5 dirty pages by soft-linking against PDFKit...

	Fixed: <rdar://problem/3880410> save 5 dirty pages by soft-linking against PDFKit framework

        Reviewed by john.

        * WebKit.pbproj/project.pbxproj:
        * WebView.subproj/WebPDFRepresentation.m:
        (+[WebPDFRepresentation PDFDocumentClass]): new
        (-[WebPDFRepresentation finishedLoadingWithDataSource:]): use PDFDocumentClass
        * WebView.subproj/WebPDFView.h:
        * WebView.subproj/WebPDFView.m:
        (+[WebPDFView PDFKitBundle]): new
        (+[WebPDFView PDFViewClass]): new
        (-[WebPDFView initWithFrame:]): create a PDFView subview
        (-[WebPDFView dealloc]): release the PDFView subview
        (-[WebPDFView PDFSubview]): new

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8015 268f45cc-cd09-0410-ab3c-d52691b4dbfc