Use the LookupIterator for SetElement and friends

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 13248 matching lines @@
   // Accessors
   CHECK_EQ(0, force_set_set_count);
   CHECK_EQ(0, force_set_get_count);
   CHECK_EQ(3, global->Get(access_property)->Int32Value());
   // CHECK_EQ the property shouldn't override it, just call the setter
   // which in this case does nothing.
   global->Set(access_property, v8::Int32::New(isolate, 7));
   CHECK_EQ(3, global->Get(access_property)->Int32Value());
   CHECK_EQ(1, force_set_set_count);
   CHECK_EQ(2, force_set_get_count);
-  // Forcing the property to be set should override the accessor without
-  // calling it
+  // ForceSet does not remove the accessors, but rather calls the setter.
   global->ForceSet(access_property, v8::Int32::New(isolate, 8));
-  CHECK_EQ(8, global->Get(access_property)->Int32Value());
-  CHECK_EQ(1, force_set_set_count);
-  CHECK_EQ(2, force_set_get_count);
+  CHECK_EQ(3, global->Get(access_property)->Int32Value());
+  CHECK_EQ(2, force_set_set_count);
+  CHECK_EQ(3, force_set_get_count);
 }
 
 
 TEST(ForceSetWithInterceptor) {
   force_set_get_count = 0;
   force_set_set_count = 0;
   pass_on_get = false;
 
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope scope(isolate);
@@ skipping 8241 matching lines @@
   CHECK_EQ(2U, set->Size());
 
   v8::Local<v8::Array> keys = set->AsArray();
   CHECK_EQ(2U, keys->Length());
   CHECK_EQ(1, keys->Get(0).As<v8::Int32>()->Value());
   CHECK_EQ(2, keys->Get(1).As<v8::Int32>()->Value());
 
   set = v8::Set::FromArray(env.local(), keys).ToLocalChecked();
   CHECK_EQ(2U, set->Size());
 }