replace anonymous runnable class with lambda (eclipse-platform#1459)

* replace anonymous runnable class with lambda

Author: elsazac

bundles/org.eclipse.jface.text/src/org/eclipse/jface/internal/text/link/contentassist/CompletionProposalPopup2.java

@@ -872,18 +872,14 @@ public void processEvent(VerifyEvent e) {
 	private void filterProposals() {
 		++ fInvocationCounter;
 		Control control= fViewer.getTextWidget();
-		control.getDisplay().asyncExec(new Runnable() {
-			long fCounter= fInvocationCounter;
-			@Override
-			public void run() {
-
-				if (fCounter != fInvocationCounter)
-					return;
-				if (fInvocationProcessedCounter == fInvocationCounter)
-					return;
+		long fCounter= fInvocationCounter;
+		control.getDisplay().asyncExec(() -> {
+			if (fCounter != fInvocationCounter)
+				return;
+			if (fInvocationProcessedCounter == fInvocationCounter)
+				return;
 
-				doFilterProposals();
-			}
+			doFilterProposals();
 		});
 	}