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/RemoveCapabilityStep.java
private Capability capability;
    private String[] natureIds;
    private IProject project;
    private ICapabilityUninstallWizard wizard;
    /**
     * Creates the remove capability step
     * 
     * @param number step order number
     * @param capability the capability to be removed
     * @param natureIds the list of nature ids to remove on the project
     * @param project the project to remove the capability from
     */
    public RemoveCapabilityStep(int number, Capability capability,
            String[] natureIds, IProject project) {
        super(number);