[d8] Remove "os" object from d8.

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 7b4d2746d7de9a27b9e961ac71d1a57b8282f1e7..84b402f7c90a369110fc98cff69b1beef2501348 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -1211,13 +1211,6 @@ Local<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
       worker_fun_template);
 #endif  // !V8_SHARED
 
-  Local<ObjectTemplate> os_templ = ObjectTemplate::New(isolate);
-  AddOSMethods(isolate, os_templ);
-  global_template->Set(
-      String::NewFromUtf8(isolate, "os", NewStringType::kNormal)
-          .ToLocalChecked(),
-      os_templ);
-
   return global_template;
 }