Bug 56588 Call Hierarchy should remove redundant mode overlays
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/callhierarchy/CallHierarchyLabelDecorator.java
/**
     * Creates a decorator. The decorator creates an own image registry to cache
     * images. 
     */
    public CallHierarchyLabelDecorator() {
        
    }   
    /* (non-Javadoc)
     * @see ILabelDecorator#decorateText(String, Object)
     */
    public String decorateText(String text, Object element) {
        return text;
    }   
    /* (non-Javadoc)
     * @see ILabelDecorator#decorateImage(Image, Object)
     */
    public Image decorateImage(Image image, Object element) {