Test by Geoff, automated by me, reviewed by Darin.

        - test for http://bugzilla.opendarwin.org/show_bug.cgi?id=7293
          REGRESSION: Using Javascript Bookmarklets that reference location.href on a blank tab crashes WebKit

        * fast/frames/empty-frame-document-expected.txt: Added.
        * fast/frames/empty-frame-document.html: Added.

WebKit:

        Test: fast/frames/empty-frame-document.html

        Reviewed by Darin.

        - fix http://bugzilla.opendarwin.org/show_bug.cgi?id=7293
          REGRESSION: Using Javascript Bookmarklets that reference location.href on a blank tab crashes WebKit

        The crash happened because an empty frame did not have a document.

        * WebView/WebFrame.m:
        (-[WebFrame _commitProvisionalLoad:]): Use "about:blank" instead of an empty URL for empty
        frames. This causes a document to be created for the frame.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@12997 268f45cc-cd09-0410-ab3c-d52691b4dbfc