Dart: Removes all but native calls and the handle watcher from the snapshot.

sky/engine/bindings/builtin.h

Index: sky/engine/bindings/builtin.h
diff --git a/sky/engine/bindings/builtin.h b/sky/engine/bindings/builtin.h
index d1c829bdf4e34124bcafcf1a9c81541cf00d0b1e..8c3bb05ad9c26cead704d9ae7c56558fe6ffe85e 100644
--- a/sky/engine/bindings/builtin.h
+++ b/sky/engine/bindings/builtin.h
@@ -17,8 +17,7 @@ class Builtin {
   enum BuiltinLibraryId {
     kBuiltinLibrary,
     kSkyLibrary,
-    kMojoBindingsLibrary,
-    kMojoCoreLibrary,
+    kMojoInternalLibrary,
     kInvalidLibrary,
   };