[contexts] Place the initial JSArray maps on the native context directly.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 2c9dace4236e20722fc23417b2cc8ace86b40dac..3a933dd32f6dd362e2a7afa2d0cb5d55c471d3ab 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -726,7 +726,6 @@ Handle<Context> Factory::NewNativeContext() {
   array->set_map_no_write_barrier(*native_context_map());
   Handle<Context> context = Handle<Context>::cast(array);
   context->set_native_context(*context);
-  context->set_js_array_maps(*undefined_value());
   context->set_errors_thrown(Smi::FromInt(0));
   Handle<WeakCell> weak_cell = NewWeakCell(context);
   context->set_self_weak_cell(*weak_cell);