Remove unused "layer" argument from show().

Change-Id: I8944a9f4a27c330b11e5e837c69b88c8f84145ba
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index 1b81e45..d55d42e 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -479,7 +479,7 @@
             layer_state_t::eLayerHidden);
 }
 
-status_t SurfaceComposerClient::show(SurfaceID id, int32_t) {
+status_t SurfaceComposerClient::show(SurfaceID id) {
     return getComposer().setFlags(this, id,
             0,
             layer_state_t::eLayerHidden);