Reviewed by Alice.

    Reviewed by Alice.

        - take away direct knowledge of WebFrame from WebDataSource

        * Loader/WebDocumentLoadState.h:
        * Loader/WebDocumentLoadState.m:
        (-[WebDocumentLoadState setFrameLoader:]):
        (-[WebDocumentLoadState detachFromFrameLoader]):
        * Loader/WebFrameLoader.m:
        (-[WebFrameLoader _setDocumentLoadState:]):
        (-[WebFrameLoader _setProvisionalDocumentLoadState:]):
        * WebView/WebDataSource.m:
        * WebView/WebDataSourceInternal.h:
        * WebView/WebDocumentLoadStateMac.m:
        (-[WebDocumentLoadStateMac detachFromFrameLoader]):
        * WebView/WebFrame.m:
        (-[WebFrame _loadDataSource:withLoadType:formState:]):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@16730 268f45cc-cd09-0410-ab3c-d52691b4dbfc