Disabled the wallpaper when completely in -1 Now space.

Bug: 11186234
Change-Id: I6ffb66f12298bd9df7e228a8589d63780b70a396
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 5e1e319..4d0349b 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -2869,7 +2869,7 @@
                 mWorkspaceBackgroundDrawable : null);
     }
 
-    void updateWallpaperVisibility(boolean visible) {
+    protected void changeWallpaperVisiblity(boolean visible) {
         int wpflags = visible ? WindowManager.LayoutParams.FLAG_SHOW_WALLPAPER : 0;
         int curflags = getWindow().getAttributes().flags
                 & WindowManager.LayoutParams.FLAG_SHOW_WALLPAPER;