Revert r14310 due to isolate tests failure.

src/d8.h

Index: src/d8.h
diff --git a/src/d8.h b/src/d8.h
index 4d9504f0d45c9656c9e52b3c58a7b83d9521774d..2789c076383be2448d4dacaa5afdf77476e4c37b 100644
--- a/src/d8.h
+++ b/src/d8.h
@@ -298,19 +298,6 @@ class Shell : public i::AllStatic {
 #endif  // ENABLE_DEBUGGER_SUPPORT
 #endif  // V8_SHARED
 
-  static Handle<Value> RealmCurrent(const Arguments& args);
-  static Handle<Value> RealmOwner(const Arguments& args);
-  static Handle<Value> RealmGlobal(const Arguments& args);
-  static Handle<Value> RealmCreate(const Arguments& args);
-  static Handle<Value> RealmDispose(const Arguments& args);
-  static Handle<Value> RealmSwitch(const Arguments& args);
-  static Handle<Value> RealmEval(const Arguments& args);
-  static Handle<Value> RealmSharedGet(Local<String> property,
-                                      const AccessorInfo& info);
-  static void RealmSharedSet(Local<String> property,
-                             Local<Value> value,
-                             const AccessorInfo& info);
-
   static Handle<Value> Print(const Arguments& args);
   static Handle<Value> Write(const Arguments& args);
   static Handle<Value> Quit(const Arguments& args);