Bug 126779 [IDE] Removed deprecated project capabilities API and implementation
It was created then deprecated before 2.0 shipped. As has never been API and we don't use it we should delete it.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/misc/ProjectCapabilitySelectionGroup.java
if (target != dependent)
            checkboxViewer.setGrayed(target, true);
        
        addDependency(target, dependent);
        
        String[] ids = registry.getMembershipSetIds(target);
        for (int j = 0; j < ids.length; j++)
            memberships.put(ids[j], target);
    }
    /**
     * Marks the capability as being unchecked.
     */
    private void markCapabilityUnchecked(Capability target) {
        
        checkedCapabilities.remove(target);
        checkboxViewer.setChecked(target, false);
        
        checkboxViewer.setGrayed(target, false);
        
        dependents.remove(target);
        
        String[] ids = registry.getMembershipSetIds(target);
        for (int j = 0; j < ids.length; j++) {
            if (memberships.get(ids[j]) == target)
                memberships.remove(ids[j]);
        }
    }
    /**
     * Returns the list of categories that have capabilities