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

mojo/dart/embedder/builtin.h

Index: mojo/dart/embedder/builtin.h
diff --git a/mojo/dart/embedder/builtin.h b/mojo/dart/embedder/builtin.h
index f1f5312aebb522a9c7d90e334705b83f6b08e2a8..b888b48349b9ba79145ae1881e2a20182f8a0056 100644
--- a/mojo/dart/embedder/builtin.h
+++ b/mojo/dart/embedder/builtin.h
@@ -26,8 +26,7 @@ class Builtin {
   // the builtin_libraries_ array in builtin.cc.
   enum BuiltinLibraryId {
     kBuiltinLibrary = 0,
-    kMojoBindingsLibrary = 1,
-    kMojoCoreLibrary = 2,
+    kMojoInternalLibrary = 1,
     kInvalidLibrary,
   };