Revert "SF: Fix a couple of Layer ref count issues"

This reverts commit 92cd24e5f648175944deef5899258981807a9ca4.

Change-Id: I551c292d8151d39bd34f2667eda384273f7cfd87
diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index 56f6607..a63656e 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -128,7 +128,7 @@
 
         // If set, defers this state update until the Layer identified by handle
         // receives a frame with the given frameNumber
-        wp<IBinder> handle;
+        sp<IBinder> handle;
         uint64_t frameNumber;
 
         // the transparentRegion hint is a bit special, it's latched only