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/CallHierarchyViewPart.java
ISelectionChangedListener {
    private CallHierarchyViewSiteAdapter fViewSiteAdapter;
    private CallHierarchyViewAdapter fViewAdapter;
    private static final String DIALOGSTORE_VIEWORIENTATION = "CallHierarchyViewPart.orientation"; 
    private static final String DIALOGSTORE_CALL_MODE = "CallHierarchyViewPart.call_mode"; 
    private static final String TAG_ORIENTATION = "orientation"; 
    private static final String TAG_CALL_MODE = "call_mode";