Bug 52159 [ActivityMgmt] Activity entry in window menu needs to be defined in object contribution
We should move the activity configuration menu entry to an object contribution in the IDE plug-in so that other applications do not have to have it or hack the UI.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/WorkbenchActionBuilder.java
/**
	 * Disposes any resources and unhooks any listeners that are no longer needed.
	 * Called when the window is closed.
	 */
	public void dispose() {
		actionBarConfigurer.getStatusLineManager().remove(statusLineItem);
		if (prefListener != null) {
			ResourcesPlugin.getPlugin().getPluginPreferences().removePropertyChangeListener(
				prefListener);
		}
		closeAction.dispose();
		closeAllAction.dispose();
		closeAllSavedAction.dispose();
		saveAction.dispose();
		saveAllAction.dispose();
		aboutAction.dispose();
		openPreferencesAction.dispose();
		saveAsAction.dispose();
		hideShowEditorAction.dispose();
		savePerspectiveAction.dispose();
		resetPerspectiveAction.dispose();
		editActionSetAction.dispose();
		closePerspAction.dispose();
		lockToolBarAction.dispose();
		closeAllPerspsAction.dispose();
		showViewMenuAction.dispose();
		showPartPaneMenuAction.dispose();
		nextPartAction.dispose();
		prevPartAction.dispose();
		nextEditorAction.dispose();