clean-up client management.

simplified things a lot, the biggest change is that the concept
of "ClientID" is now gone, instead we simply use references.

Change-Id: Icbc57f80865884aa5f35ad0d0a0db26f19f9f7ce
diff --git a/libs/surfaceflinger/LayerDim.cpp b/libs/surfaceflinger/LayerDim.cpp
index 568fedb..d528d2f 100644
--- a/libs/surfaceflinger/LayerDim.cpp
+++ b/libs/surfaceflinger/LayerDim.cpp
@@ -39,8 +39,8 @@
 // ---------------------------------------------------------------------------
 
 LayerDim::LayerDim(SurfaceFlinger* flinger, DisplayID display,
-        const sp<Client>& client, int32_t i)
-    : LayerBaseClient(flinger, display, client, i)
+        const sp<Client>& client)
+    : LayerBaseClient(flinger, display, client)
 {
 }