Reviewed by Darin.

    Reviewed by Darin.

        - wean WebFrameLoader from WebDataSource private stuff

        (actually just tweaks tot he above to make merging my future
        patches easier since Darin did a lot of the same stuff)

        * Loader/WebDocumentLoader.h:
        * Loader/WebDocumentLoader.m:
        (-[WebDocumentLoader URLForHistory]):
        * Loader/WebFrameLoader.m:
        (-[WebFrameLoader _loadRequest:archive:]):
        (-[WebFrameLoader revertToProvisionalWithDocumentLoader:]):
        (-[WebFrameLoader documentLoader:setMainDocumentError:]):
        (-[WebFrameLoader finalSetupForReplaceWithDocumentLoader:]):
        (-[WebFrameLoader didChangeTitleForDocument:]):
        (-[WebFrameLoader loadDocumentLoader:withLoadType:formState:]):
        * Loader/WebFrameLoaderClient.h:
        * WebView/WebDataSource.m:
        (-[WebDataSource _URLForHistory]):
        * WebView/WebFrame.m:
        (-[WebFrame _addDocumentLoader:toUnarchiveState:]):
        (-[WebFrame _revertToProvisionalStateForDocumentLoader:]):
        (-[WebFrame _setMainDocumentError:forDocumentLoader:]):
        (-[WebFrame _clearUnarchivingStateForLoader:]):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@16936 268f45cc-cd09-0410-ab3c-d52691b4dbfc