Directly create API functions with readonly prototypes rather than converting. Remove FunctionSetRe…

src/factory.h

 // Copyright 2014 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.
 
 #ifndef V8_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "isolate.h"
 
 namespace v8 {
@@ skipping 435 matching lines @@
   // object that has been freshly allocated using the constructor.
   void ReinitializeJSGlobalProxy(Handle<JSGlobalProxy> global,
                                  Handle<JSFunction> constructor);
 
   // Change the type of the argument into a JS object/function and reinitialize.
   void BecomeJSObject(Handle<JSReceiver> object);
   void BecomeJSFunction(Handle<JSReceiver> object);
 
   Handle<JSFunction> NewFunction(Handle<String> name,
                                  Handle<Code> code,
-                                 Handle<Object> prototype);
+                                 Handle<Object> prototype,
+                                 bool read_only_prototype = false);
   Handle<JSFunction> NewFunction(Handle<String> name);
   Handle<JSFunction> NewFunctionWithoutPrototype(Handle<String> name,
                                                  Handle<Code> code);
 
   Handle<JSFunction> NewFunctionFromSharedFunctionInfo(
       Handle<SharedFunctionInfo> function_info,
       Handle<Context> context,
       PretenureFlag pretenure = TENURED);
 
   Handle<JSFunction> NewFunction(Handle<String> name,
                                  Handle<Code> code,
                                  Handle<Object> prototype,
                                  InstanceType type,
-                                 int instance_size);
+                                 int instance_size,
+                                 bool read_only_prototype = false);
   Handle<JSFunction> NewFunction(Handle<String> name,
                                  Handle<Code> code,
                                  InstanceType type,
                                  int instance_size);
 
   // Create a serialized scope info.
   Handle<ScopeInfo> NewScopeInfo(int length);
 
   // Create an External object for V8's external API.
   Handle<JSObject> NewExternal(void* value);
@@ skipping 210 matching lines @@
                                  PretenureFlag pretenure = TENURED);
 
   Handle<JSFunction> NewFunction(Handle<Map> map,
                                  Handle<String> name,
                                  MaybeHandle<Code> maybe_code);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_FACTORY_H_