Remove --promise-extra flag

include/v8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 3390 matching lines @@
     Resolver();
     static void CheckCast(Value* obj);
   };
 
   /**
    * Register a resolution/rejection handler with a promise.
    * The handler is given the respective resolution/rejection value as
    * an argument. If the promise is already resolved/rejected, the handler is
    * invoked at the end of turn.
    */
-  V8_DEPRECATED("Use maybe version of Then",
-                Local<Promise> Chain(Local<Function> handler));
-  V8_DEPRECATED("Use Then",
-                V8_WARN_UNUSED_RESULT MaybeLocal<Promise> Chain(
-                    Local<Context> context, Local<Function> handler));
-
   V8_DEPRECATED("Use maybe version",
                 Local<Promise> Catch(Local<Function> handler));
   V8_WARN_UNUSED_RESULT MaybeLocal<Promise> Catch(Local<Context> context,
                                                   Local<Function> handler);
 
   V8_DEPRECATED("Use maybe version",
                 Local<Promise> Then(Local<Function> handler));
   V8_WARN_UNUSED_RESULT MaybeLocal<Promise> Then(Local<Context> context,
                                                  Local<Function> handler);
 
@@ skipping 5559 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_