http://bugzilla.opendarwin.org/show_bug.cgi?id=8876
        - move most private WebDataSource methods to uninstalled header
        
        I put the declarations for the ones only used in WebKit in WebDataSourceInternal.h
        and removed two entirey unused ones.

        * Plugins/WebNetscapePluginRepresentation.m:
        * Plugins/WebNetscapePluginStream.m:
        * Plugins/WebPluginController.m:
        * Plugins/WebPluginDocumentView.m:
        * WebCoreSupport/WebFrameBridge.m:
        (-[WebFrameBridge dataSource]):
        * WebCoreSupport/WebSubresourceLoader.m:
        * WebKit.xcodeproj/project.pbxproj:
        * WebView/WebDataSource.m:
        (-[WebDataSource _updateIconDatabaseWithURL:]):
        (-[WebDataSource _loadIcon]):
        (-[WebDataSource _clearErrors]):
        (-[WebDataSource _commitLoadWithData:]):
        (-[WebDataSource _doesProgressiveLoadWithMIMEType:]):
        (-[WebDataSource _addResponse:]):
        * WebView/WebDataSourceInternal.h: Added.
        * WebView/WebDataSourcePrivate.h:
        * WebView/WebFrame.m:
        * WebView/WebHTMLRepresentation.m:
        * WebView/WebHTMLView.m:
        * WebView/WebImageView.m:
        * WebView/WebLoader.m:
        * WebView/WebMainResourceLoader.m:
        * WebView/WebPDFView.m:
        * WebView/WebRenderNode.m:
        * WebView/WebView.m:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@14333 268f45cc-cd09-0410-ab3c-d52691b4dbfc