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/IDEWorkbenchPlugin.java
if (markerImageProviderRegistry == null) {
            markerImageProviderRegistry = new MarkerImageProviderRegistry();
        }
        return markerImageProviderRegistry;
    }
    /**
     * Returns the capability registry for the workbench.
     * 
     * @return the capability registry
     */
    public CapabilityRegistry getCapabilityRegistry() {
        if (capabilityRegistry == null) {
            capabilityRegistry = new CapabilityRegistry();
            capabilityRegistry.load();
        }
        return capabilityRegistry;
    }
    /**
     * Returns the about information of all known features,
     * omitting any features which are missing this information.
     * 
     * @return a possibly empty list of about infos
     */
    public AboutInfo[] getFeatureInfos() {
        
        List infos = new ArrayList();
        
        IBundleGroupProvider[] providers = Platform.getBundleGroupProviders();
        if (providers != null)
            for (int i = 0; i < providers.length; ++i) {