Move wallpapers to external activity

Also renaming Launcher's ApplicationInfo to
AppInfo since ApplicationInfo is already a 
framework class

Change-Id: Ib3e91d2ba4ace458d790a26c0ce850870fd3f146
diff --git a/src/com/android/launcher3/InfoDropTarget.java b/src/com/android/launcher3/InfoDropTarget.java
index a643a0d..2ad43b6 100644
--- a/src/com/android/launcher3/InfoDropTarget.java
+++ b/src/com/android/launcher3/InfoDropTarget.java
@@ -72,8 +72,8 @@
         // in onDrop, because it allows us to reject the drop (by returning false)
         // so that the object being dragged isn't removed from the drag source.
         ComponentName componentName = null;
-        if (d.dragInfo instanceof ApplicationInfo) {
-            componentName = ((ApplicationInfo) d.dragInfo).componentName;
+        if (d.dragInfo instanceof AppInfo) {
+            componentName = ((AppInfo) d.dragInfo).componentName;
         } else if (d.dragInfo instanceof ShortcutInfo) {
             componentName = ((ShortcutInfo) d.dragInfo).intent.getComponent();
         } else if (d.dragInfo instanceof PendingAddItemInfo) {