Revert of Enable promotion of RenderPassDrawQuads to CALayers.

cc/output/ca_layer_overlay.h

Index: cc/output/ca_layer_overlay.h
diff --git a/cc/output/ca_layer_overlay.h b/cc/output/ca_layer_overlay.h
index 34eb054e8c729f4c3cff1930aadc494f0e76d0ef..17b4be223679c7bbdafa90f499bc869cd0dc3d2d 100644
--- a/cc/output/ca_layer_overlay.h
+++ b/cc/output/ca_layer_overlay.h
@@ -77,6 +77,9 @@
                                const QuadList& quad_list,
                                CALayerOverlayList* ca_layer_overlays);
 
+// Allows RenderPassDrawQuads to be converted to CALayerOverlays.
+void CC_EXPORT EnableRenderPassDrawQuadForTesting();
+
 }  // namespace cc
 
 #endif  // CC_OUTPUT_CA_LAYER_OVERLAY_H_