Frameworks: Remove AsyncTask from preloaded-classes

Bug: 113624968
Test: m
Change-Id: I77be78138f13fdc6d3a26aea3f59d01ef0e745e8
diff --git a/config/preloaded-classes-blacklist b/config/preloaded-classes-blacklist
index 8b8d640..eca3bf3 100644
--- a/config/preloaded-classes-blacklist
+++ b/config/preloaded-classes-blacklist
@@ -1,4 +1,5 @@
 android.net.ConnectivityThread$Singleton
+android.os.AsyncTask
 android.os.FileObserver
 android.widget.Magnifier
 sun.nio.fs.UnixChannelFactory