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/ProjectCapabilityPropertyPage.java
}
    /* (non-Javadoc)
     * Method declared on PreferencePage
     */
    public boolean performOk() {
        
        if (!capabilityGroup.getCapabilitiesModified())
            return true;
        
        CapabilityRegistry reg = IDEWorkbenchPlugin.getDefault()
                .getCapabilityRegistry();
        Capability[] caps = capabilityGroup.getSelectedCapabilities();
        IStatus status = reg.validateCapabilities(caps);
        if (!status.isOK()) {
            ErrorDialog
                    .openError(
                            getShell(),
                            IDEWorkbenchMessages.ProjectCapabilityPropertyPage_errorTitle,
                            IDEWorkbenchMessages.ProjectCapabilityPropertyPage_invalidSelection,
                            status);
            return true;
        }
        
        String[] natureIds;
        try {
            natureIds = getProject().getDescription().getNatureIds();
            natureIds = getProject().getWorkspace().sortNatureSet(natureIds);
        } catch (CoreException e) {
            ErrorDialog
                    .openError(