Re-enable -Werror on clang

Change-Id: I582bd0665752c7a9deb4f9de094d0dd0a50cda6a
diff --git a/libs/hwui/DeferredLayerUpdater.h b/libs/hwui/DeferredLayerUpdater.h
index 82f2741..df7c594 100644
--- a/libs/hwui/DeferredLayerUpdater.h
+++ b/libs/hwui/DeferredLayerUpdater.h
@@ -35,7 +35,7 @@
 public:
     // Note that DeferredLayerUpdater assumes it is taking ownership of the layer
     // and will not call incrementRef on it as a result.
-    ANDROID_API DeferredLayerUpdater(renderthread::RenderThread& thread, Layer* layer);
+    ANDROID_API DeferredLayerUpdater(Layer* layer);
     ANDROID_API ~DeferredLayerUpdater();
 
     ANDROID_API bool setSize(int width, int height) {
@@ -101,7 +101,6 @@
 
     Layer* mLayer;
     Caches& mCaches;
-    renderthread::RenderThread& mRenderThread;
 
     void doUpdateTexImage();
 };