Eliminate obsolete flag.

The FLAG_KEEP_SURFACE_WHILE_ANIMATING has been removed.

Change-Id: Ia9623fb1fd5a124145bbb827acfb77767b05f636
diff --git a/src/com/android/nfc/SendUi.java b/src/com/android/nfc/SendUi.java
index ae54e0a..5c20085 100644
--- a/src/com/android/nfc/SendUi.java
+++ b/src/com/android/nfc/SendUi.java
@@ -190,7 +190,6 @@
                 WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
                 WindowManager.LayoutParams.FLAG_FULLSCREEN
                 | hwAccelerationFlags
-                | WindowManager.LayoutParams.FLAG_KEEP_SURFACE_WHILE_ANIMATING
                 | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN,
                 PixelFormat.OPAQUE);
         mWindowLayoutParams.token = new Binder();