Revert of Moved ambient lights out of SkLight's light array

tests/SerializationTest.cpp

Index: tests/SerializationTest.cpp
diff --git a/tests/SerializationTest.cpp b/tests/SerializationTest.cpp
index ff9b342074adc1d7d8b5d54d4c7364077cda633b..11a705f8ce031bfb959b861a642748b1f8e8593e 100644
--- a/tests/SerializationTest.cpp
+++ b/tests/SerializationTest.cpp
@@ -558,7 +558,7 @@
 
         builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(1.0f, 1.0f, 1.0f),
                                                      SkVector3::Make(1.0f, 0.0f, 0.0f)));
-        builder.setAmbientLightColor(SkColor3f::Make(0.2f, 0.2f, 0.2f));
+        builder.add(SkLights::Light::MakeAmbient(SkColor3f::Make(0.2f, 0.2f, 0.2f)));
 
         sk_sp<SkLights> fLights = builder.finish();