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
label.setFont(font);
        label.setText(""); 
        addButton = new Button(buttonComposite, SWT.PUSH);
        addButton.setText(IDEWorkbenchMessages.ProjectCapabilityEditingPropertyPage_add);
        addButton.setEnabled(true);
        addButton.addSelectionListener(new SelectionListener() {
            public void widgetSelected(SelectionEvent e) {
                addCapability();
            }
            public void widgetDefaultSelected(SelectionEvent e) {
            }
        });
        GridData data = new GridData();
        data.horizontalAlignment = GridData.FILL;
        int widthHint = convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
        data.widthHint = Math.max(widthHint, addButton.computeSize(SWT.DEFAULT,
                SWT.DEFAULT, true).x);
        addButton.setLayoutData(data);
        addButton.setFont(font);
        removeButton = new Button(buttonComposite, SWT.PUSH);
        removeButton.setText(IDEWorkbenchMessages.ProjectCapabilityEditingPropertyPage_remove);
        removeButton.setEnabled(false);
        removeButton.addSelectionListener(new SelectionListener() {
            public void widgetSelected(SelectionEvent e) {
                removeCapability(selectedCap);
            }
            public void widgetDefaultSelected(SelectionEvent e) {
            }
        });
        data = new GridData();