Reviewed by Darin.

    Reviewed by Darin.

        - Move all delegate dispatching code out of WebDataSource.

        * Loader/WebFrameLoader.m:
        (-[WebFrameLoader startLoading]):
        (-[WebFrameLoader _identifierForInitialRequest:]):
        (-[WebFrameLoader _willSendRequest:forResource:redirectResponse:]):
        (-[WebFrameLoader _didReceiveAuthenticationChallenge:forResource:]):
        (-[WebFrameLoader _didCancelAuthenticationChallenge:forResource:]):
        (-[WebFrameLoader _didReceiveResponse:forResource:]):
        (-[WebFrameLoader _didReceiveData:contentLength:forResource:]):
        (-[WebFrameLoader _didFinishLoadingForResource:]):
        (-[WebFrameLoader _didFailLoadingWithError:forResource:]):
        (-[WebFrameLoader _receivedMainResourceError:complete:]):
        (-[WebFrameLoader _downloadWithLoadingConnection:request:response:proxy:]):
        (-[WebFrameLoader _checkContentPolicyForMIMEType:andCall:withSelector:]):
        * WebView/WebDataSource.m:
        (-[WebDataSource _setLoadingFromPageCache:]):
        (-[WebDataSource _stopLoadingWithError:]):
        * WebView/WebDataSourceInternal.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@16870 268f45cc-cd09-0410-ab3c-d52691b4dbfc