Fix build

Change-Id: I34b052159a393842bad707921205ea2778c1cbfe
diff --git a/src/com/android/launcher2/Workspace.java b/src/com/android/launcher2/Workspace.java
index 1bd0a35..7248950 100644
--- a/src/com/android/launcher2/Workspace.java
+++ b/src/com/android/launcher2/Workspace.java
@@ -58,6 +58,7 @@
 import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.HashSet;
+import java.util.Iterator;
 import java.util.Set;
 
 /**