Clean-up use lambdas and method references on examples.undo

Using the JDT cleanup action -> Use lambda where possible
Simplify lambda expression and method reference syntax

Change-Id: I16e9c7530e745128c42ad1ecc865b0056ff643e7
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>
diff --git a/examples/org.eclipse.ui.examples.undo/Eclipse UI Examples Undo/org/eclipse/ui/examples/undo/views/BoxView.java b/examples/org.eclipse.ui.examples.undo/Eclipse UI Examples Undo/org/eclipse/ui/examples/undo/views/BoxView.java
index 7d3ecfc..9a583c2 100644
--- a/examples/org.eclipse.ui.examples.undo/Eclipse UI Examples Undo/org/eclipse/ui/examples/undo/views/BoxView.java
+++ b/examples/org.eclipse.ui.examples.undo/Eclipse UI Examples Undo/org/eclipse/ui/examples/undo/views/BoxView.java
@@ -295,7 +295,7 @@
 	private void hookContextMenu() {
 		MenuManager menuMgr = new MenuManager("#PopupMenu");
 		menuMgr.setRemoveAllWhenShown(true);
-		menuMgr.addMenuListener(manager -> BoxView.this.fillContextMenu(manager));
+		menuMgr.addMenuListener(BoxView.this::fillContextMenu);
 		Menu menu = menuMgr.createContextMenu(paintCanvas);
 		paintCanvas.setMenu(menu);
 	}
diff --git a/examples/org.eclipse.ui.examples.undo/Eclipse UI Examples Undo/org/eclipse/ui/examples/undo/views/UndoHistoryView.java b/examples/org.eclipse.ui.examples.undo/Eclipse UI Examples Undo/org/eclipse/ui/examples/undo/views/UndoHistoryView.java
index 33d8921b..ac78c95 100644
--- a/examples/org.eclipse.ui.examples.undo/Eclipse UI Examples Undo/org/eclipse/ui/examples/undo/views/UndoHistoryView.java
+++ b/examples/org.eclipse.ui.examples.undo/Eclipse UI Examples Undo/org/eclipse/ui/examples/undo/views/UndoHistoryView.java
@@ -293,7 +293,7 @@
 	private void hookContextMenu() {
 		MenuManager menuMgr = new MenuManager("#PopupMenu");
 		menuMgr.setRemoveAllWhenShown(true);
-		menuMgr.addMenuListener(manager -> UndoHistoryView.this.fillContextMenu(manager));
+		menuMgr.addMenuListener(UndoHistoryView.this::fillContextMenu);
 		Menu menu = menuMgr.createContextMenu(viewer.getControl());
 		viewer.getControl().setMenu(menu);
 		getSite().registerContextMenu(menuMgr, viewer);