3135779 - REGRESSION: reproducible assertion failure, going back from ~orubin to the main spies.com page	
	3136218 - REGRESSION: Assertion failure in _restoreScrollPosition running browser buster

	Both were caused by subtle interactions between new code for short-circuiting loading of
	blank pages, and the WebHistoryItem manipulations we do for b/f and reload of child frames.

        Reviewed by Maciej

        * WebView.subproj/WebFramePrivate.m:
        (-[WebFrame _loadURL:intoChild:]):  Setup provisional or current item before jumping into
	the real work of loading the URL.
        (-[WebFrame _restoreScrollPosition]):  Tweaked to make the assertion message clearer.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@3212 268f45cc-cd09-0410-ab3c-d52691b4dbfc