- remove knowledge of WebView from WebLoader in preparation for moving the code down

        * WebView/WebDataSource.m:
        (-[WebDataSource _defersCallbacks]):
        (-[WebDataSource _identifierForInitialRequest:]):
        (-[WebDataSource _willSendRequest:forResource:redirectResponse:]):
        (-[WebDataSource _didReceiveAuthenticationChallenge:forResource:]):
        (-[WebDataSource _didCancelAuthenticationChallenge:forResource:]):
        (-[WebDataSource _didReceiveResponse:forResource:]):
        (-[WebDataSource _didReceiveData:contentLength:forResource:]):
        (-[WebDataSource _didFinishLoadingForResource:]):
        (-[WebDataSource _didFailLoadingWithError:forResource:]):
        (-[WebDataSource _downloadWithLoadingConnection:request:response:proxy:]):
        (-[WebDataSource _privateBrowsingEnabled]):
        * WebView/WebDataSourceInternal.h:
        * WebView/WebLoader.h:
        * WebView/WebLoader.m:
        (-[WebLoader releaseResources]):
        (-[WebLoader setDataSource:]):
        (-[WebLoader willSendRequest:redirectResponse:]):
        (-[WebLoader didReceiveAuthenticationChallenge:]):
        (-[WebLoader didCancelAuthenticationChallenge:]):
        (-[WebLoader didReceiveResponse:]):
        (-[WebLoader didReceiveData:lengthReceived:]):
        (-[WebLoader signalFinish]):
        (-[WebLoader didFinishLoading]):
        (-[WebLoader didFailWithError:]):
        (-[WebLoader willCacheResponse:]):
        (-[WebLoader cancelWithError:]):
        * WebView/WebMainResourceLoader.m:
        (-[WebMainResourceLoader continueAfterContentPolicy:response:]):
        * WebView/WebView.m:
        (-[WebView _incrementProgressForIdentifier:response:]):
        (-[WebView _incrementProgressForIdentifier:data:]):
        (-[WebView _completeProgressForIdentifier:]):
        * WebView/WebViewInternal.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@14533 268f45cc-cd09-0410-ab3c-d52691b4dbfc