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
* Creates a new ProjectCapabilityEditingPropertyPage.
     */
    public ProjectCapabilityEditingPropertyPage() {
        super();
    }
    /* (non-Javadoc)
     * Method declared on PreferencePage
     */
    protected Control createContents(Composite parent) {
        Font font = parent.getFont();
        PlatformUI.getWorkbench().getHelpSystem().setHelp(getControl(),
                IIDEHelpContextIds.PROJECT_CAPABILITY_PROPERTY_PAGE);
        noDefaultAndApplyButton();
        reg = IDEWorkbenchPlugin.getDefault().getCapabilityRegistry();
        Composite topComposite = new Composite(parent, SWT.NONE);
        GridLayout layout = new GridLayout();
        layout.marginHeight = 0;
        layout.marginWidth = 0;
        topComposite.setLayout(layout);
        topComposite.setLayoutData(new GridData(GridData.FILL_BOTH));
        String instructions;
        if (reg.hasCapabilities())
            instructions = IDEWorkbenchMessages.ProjectCapabilityPropertyPage_chooseCapabilities;
        else
            instructions = IDEWorkbenchMessages.ProjectCapabilityPropertyPage_noCapabilities;
        Label label = new Label(topComposite, SWT.LEFT);
        label.setFont(font);
        label.setText(instructions);
        Capability[] caps = reg.getProjectDisabledCapabilities(getProject());
        disabledCaps.addAll(Arrays.asList(caps));