- Change things around so WebFrameLoader tracks the main and provisional data source,
        as well as the frame load state, pulling much code out of WebFrame along the way.
        
        The most significant aspects of this change are:
        
        - management of WebDataSources and WebFrameState was moved into WebFrameLoader
        - there is now just one WebFrameLoader shared between the primary and provisional data source

        * WebKit.xcodeproj/project.pbxproj:
        * WebView/WebDataSource.m:
        (-[WebDataSourcePrivate dealloc]):
        (-[WebDataSource _updateLoading]):
        (-[WebDataSource _loadIcon]):
        (-[WebDataSource _setPrimaryLoadComplete:]):
        (-[WebDataSource _stopLoading]):
        (-[WebDataSource _startLoading]):
        (-[WebDataSource _addSubresourceLoader:]):
        (-[WebDataSource _removeSubresourceLoader:]):
        (-[WebDataSource _addPlugInStreamLoader:]):
        (-[WebDataSource _removePlugInStreamLoader:]):
        (-[WebDataSource _defersCallbacksChanged]):
        (-[WebDataSource _stopLoadingWithError:]):
        (-[WebDataSource _revertToProvisionalState]):
        (-[WebDataSource _setupForReplaceByMIMEType:]):
        (-[WebDataSource initWithRequest:]):
        (-[WebDataSource data]):
        (-[WebDataSource isLoading]):
        * WebView/WebFrame.m:
        (-[WebFramePrivate init]):
        (-[WebFramePrivate dealloc]):
        (-[WebFrame _closeOldDataSources]):
        (-[WebFrame _detachFromParent]):
        (-[WebFrame _makeDocumentView]):
        (-[WebFrame _receivedMainResourceError:]):
        (-[WebFrame _transitionToCommitted:]):
        (+[WebFrame _timeOfLastCompletedLoad]):
        (-[WebFrame _checkLoadCompleteForThisFrame]):
        (-[WebFrame _loadItem:withLoadType:]):
        (-[WebFrame _continueAfterWillSubmitForm:]):
        (-[WebFrame _continueLoadRequestAfterNavigationPolicy:formState:]):
        (-[WebFrame _initWithWebFrameView:webView:bridge:]):
        (-[WebFrame _frameLoader]):
        (-[WebFrame _provisionalLoadStarted]):
        (-[WebFrame _prepareForDataSourceReplacement]):
        (-[WebFrame _frameLoadCompleted]):
        (-[WebFrame provisionalDataSource]):
        (-[WebFrame dataSource]):
        (-[WebFrame stopLoading]):
        * WebView/WebFrameInternal.h:
        * WebView/WebFrameLoader.h:
        * WebView/WebFrameLoader.m:
        (-[WebFrameLoader initWithWebFrame:]):
        (-[WebFrameLoader dealloc]):
        (-[WebFrameLoader dataSource]):
        (-[WebFrameLoader _setDataSource:]):
        (-[WebFrameLoader clearDataSource]):
        (-[WebFrameLoader provisionalDataSource]):
        (-[WebFrameLoader _setProvisionalDataSource:]):
        (-[WebFrameLoader _clearProvisionalDataSource]):
        (-[WebFrameLoader state]):
        (+[WebFrameLoader timeOfLastCompletedLoad]):
        (-[WebFrameLoader _setState:]):
        (-[WebFrameLoader clearProvisionalLoad]):
        (-[WebFrameLoader markLoadComplete]):
        (-[WebFrameLoader commitProvisionalLoad]):
        (-[WebFrameLoader stopLoading]):
        (-[WebFrameLoader startLoading]):
        (-[WebFrameLoader startProvisionalLoad:]):
        (-[WebFrameLoader setupForReplace]):
        * WebView/WebFramePrivate.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@15751 268f45cc-cd09-0410-ab3c-d52691b4dbfc