Bug 552423 - Replace usage of deprecated AbstractUIPlugin#getWorkbench

Change-Id: Iab73cb2ad17bc61a05e8959495f5425d7d55532a
Signed-off-by: Karsten Thoms <karsten.thoms@itemis.de>
diff --git a/ant/org.eclipse.ant.ui/Ant Tools Support/org/eclipse/ant/internal/ui/AntUIPlugin.java b/ant/org.eclipse.ant.ui/Ant Tools Support/org/eclipse/ant/internal/ui/AntUIPlugin.java
index 3e45eff..843741f 100644
--- a/ant/org.eclipse.ant.ui/Ant Tools Support/org/eclipse/ant/internal/ui/AntUIPlugin.java
+++ b/ant/org.eclipse.ant.ui/Ant Tools Support/org/eclipse/ant/internal/ui/AntUIPlugin.java
@@ -29,6 +29,7 @@
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.ui.IWorkbenchPage;
 import org.eclipse.ui.IWorkbenchWindow;
+import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.editors.text.EditorsUI;
 import org.eclipse.ui.plugin.AbstractUIPlugin;
 import org.eclipse.ui.texteditor.ChainedPreferenceStore;
@@ -213,7 +214,7 @@
 	 * Returns the active workbench window or <code>null</code> if none
 	 */
 	public static IWorkbenchWindow getActiveWorkbenchWindow() {
-		return getDefault().getWorkbench().getActiveWorkbenchWindow();
+		return PlatformUI.getWorkbench().getActiveWorkbenchWindow();
 	}
 
 	/**