Eradicate DisplayID.

DisplayDevices are now keyed of the wp<IBinder> the client uses.
DisplayID has now become DisplayType which is just used to identify
physical displays (as opposed to virtual displays such as wifi displays).

Change-Id: I0c5968f2c902dcd699a7e0afacf833ff070c12ea
diff --git a/services/surfaceflinger/LayerDim.cpp b/services/surfaceflinger/LayerDim.cpp
index 087d851..25caa0a 100644
--- a/services/surfaceflinger/LayerDim.cpp
+++ b/services/surfaceflinger/LayerDim.cpp
@@ -33,9 +33,8 @@
 namespace android {
 // ---------------------------------------------------------------------------
 
-LayerDim::LayerDim(SurfaceFlinger* flinger, DisplayID display,
-        const sp<Client>& client)
-    : LayerBaseClient(flinger, display, client)
+LayerDim::LayerDim(SurfaceFlinger* flinger, const sp<Client>& client)
+    : LayerBaseClient(flinger, client)
 {
 }