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/dialogs/ProjectCapabilityEditingPropertyPage.java
wizard.setContainer(new StubContainer());
            wizard.performFinish();
            wizard.setContainer(null);
        } else {
            wizard = cap.getUninstallWizard();
            if (wizard == null)
                wizard = new RemoveCapabilityWizard();
            if (wizard != null)
                wizard.init(PlatformUI.getWorkbench(),
                        StructuredSelection.EMPTY, getProject(), natureIds);
            WizardDialog dialog = new WizardDialog(getShell(), wizard);
            dialog.create();
            dialog.getShell().setSize(
                    Math
                            .max(SIZING_WIZARD_WIDTH, dialog.getShell()
                                    .getSize().x), SIZING_WIZARD_HEIGHT);
            PlatformUI.getWorkbench().getHelpSystem().setHelp(
					dialog.getShell(),
					IIDEHelpContextIds.UPDATE_CAPABILITY_WIZARD);
            dialog.open();
        }
        table.refresh();
    }
    /* (non-Javadoc)
     * Method declared on PreferencePage
     */
    public boolean performOk() {
        return true;
    }
    class CapabilityLabelProvider extends LabelProvider {