Remove unused View.flushLayer() API

Change-Id: I5d4c7388afb5265964ab6b769cc0abfee9745c84
diff --git a/libs/hwui/LayerRenderer.h b/libs/hwui/LayerRenderer.h
index 8f3a0a3..531aa5b 100644
--- a/libs/hwui/LayerRenderer.h
+++ b/libs/hwui/LayerRenderer.h
@@ -61,12 +61,13 @@
             bool isOpaque, GLenum renderTarget, float* transform);
     ANDROID_API static void destroyLayer(Layer* layer);
     ANDROID_API static void destroyLayerDeferred(Layer* layer);
-    ANDROID_API static void flushLayer(Layer* layer);
     ANDROID_API static bool copyLayer(Layer* layer, SkBitmap* bitmap);
 
 private:
     void generateMesh();
 
+    static void flushLayer(Layer* layer);
+
     Layer* mLayer;
 }; // class LayerRenderer