Correct implementation of saveLayer().

Change-Id: I5375126636913e0a84f2d6bbd0ebe40d2e4f2763
diff --git a/libs/hwui/LayerCache.h b/libs/hwui/LayerCache.h
index 9860994..c0c7542 100644
--- a/libs/hwui/LayerCache.h
+++ b/libs/hwui/LayerCache.h
@@ -62,10 +62,8 @@
      * size of the cache goes down.
      *
      * @param size The dimensions of the desired layer
-     * @param previousFbo The name of the FBO to bind to if creating a new
-     *        layer fails
      */
-    Layer* get(LayerSize& size, GLuint previousFbo);
+    Layer* get(LayerSize& size);
     /**
      * Adds the layer to the cache. The layer will not be added if there is
      * not enough space available.