Bug 46351 Call Hierarchy must not implement IViewSite [call hierarchy]
I20031105 The call hierarchy component implements IViewSite which is not allowed. There seems to be no reason for doing so: the CallHierarchyViewPart should directly set the selection provider to its site.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/callhierarchy/SelectionProviderMediator.java
private class InternalListener implements ISelectionChangedListener, FocusListener {
		/*
	 	 * @see ISelectionChangedListener#selectionChanged
	 	 */		
		public void selectionChanged(SelectionChangedEvent event) {