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
Collections.sort(visibleCapabilities, capabilityComparator);
                    checkboxViewer.refresh();
                    itr = visibleCapabilities.iterator();
                    while (itr.hasNext()) {
                        Capability cap = (Capability) itr.next();
                        if (hasDependency(cap))
                            checkboxViewer.setGrayed(cap, true);
                        if (checkedCapabilities.contains(cap))
                            checkboxViewer.setChecked(cap, true);
                    }
                    updateDescription(checkboxViewer.getSelection());
                }
            }
        });
        
        if (initialCapabilities != null)
            checkedCapabilities.addAll(Arrays.asList(initialCapabilities));
        if (initialCategories != null)
            listViewer.setSelection(new StructuredSelection(initialCategories));
        return composite;
    }
    /**
     * Marks the capability as being checked.
     */
    private void markCapabilityChecked(Capability target, Capability dependent) {
        
        if (!checkedCapabilities.contains(target))
            checkedCapabilities.add(target);
        checkboxViewer.setChecked(target, true);