Revert app freeze timeout delay.

Speed up of wallpaper loading on Manta means this workaround is no
longer necessary.

Bug 7354440 fixed.

Change-Id: Ic0ad3c689abb5342fb29c824857db9d5c2d45008

Author: Craig Mautner

services/java/com/android/server/wm/WindowManagerService.java

@@ -265,7 +265,7 @@ public class WindowManagerService extends IWindowManager.Stub
     static final int DEFAULT_FADE_IN_OUT_DURATION = 400;
 
     /** Amount of time (in milliseconds) to delay before declaring a window freeze timeout. */
-    static final int WINDOW_FREEZE_TIMEOUT_DURATION = 3000;
+    static final int WINDOW_FREEZE_TIMEOUT_DURATION = 2000;
 
     /**
      * If true, the window manager will do its own custom freezing and general