Revert of Reland: [modules] Properly initialize declared variables.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index df02a3248ea3e232e4ee8013cba92d292ad7b455..16e77300a03ab6ba622b11a0d403dee8fa7bb42e 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -702,12 +702,6 @@
                         Builtins::kGeneratorPrototypeReturn, 1, true);
   SimpleInstallFunction(generator_object_prototype, "throw",
                         Builtins::kGeneratorPrototypeThrow, 1, true);
-
-  // Internal version of generator_prototype_next, flagged as non-native.
-  Handle<JSFunction> generator_next_internal =
-      SimpleCreateFunction(isolate(), factory()->next_string(),
-                           Builtins::kGeneratorPrototypeNext, 1, true);
-  native_context()->set_generator_next_internal(*generator_next_internal);
 
   // Create maps for generator functions and their prototypes.  Store those
   // maps in the native context. The "prototype" property descriptor is