refactor(runtime): drop the host-object claim gate's messaging half

The serializer claims custom host objects unconditionally now, so the
"any ports or transfer brands exist" flag that extended the former gate has
no reader.

Author: edusperoni

NativeScript/runtime/Messaging.cpp

@@ -44,7 +44,6 @@ struct MessagingState {
   // plain object in every graph. An isolate that has neither created a port
   // nor stamped a brand cannot be holding either, so it keeps serializing on
   // the cheap path.
-  bool claimHostObjects = false;
 };
 
 // The isolate's Caches is invalidated long before ~Runtime reaches the point
@@ -181,12 +180,8 @@ void StampBrand(const FunctionCallbackInfo<Value>& info,
   if (brand.IsEmpty()) {
     return;
   }
-  if (info[0]
-          .As<Object>()
-          ->SetPrivate(isolate->GetCurrentContext(), brand, v8::True(isolate))
-          .FromMaybe(false)) {
-    State(isolate)->claimHostObjects = true;
-  }
+  (void)info[0].As<Object>()->SetPrivate(isolate->GetCurrentContext(), brand,
+                                         v8::True(isolate));
 }
 
 }  // namespace
@@ -411,7 +406,6 @@ std::shared_ptr<NativeMessagePort> NativeMessagePort::New(
   wrapper->SetAlignedPointerInInternalField(0, port.get(),
                                             v8::kEmbedderDataTypeTagDefault);
   state->livePorts.insert(port);
-  state->claimHostObjects = true;
 
   if (data != nullptr) {
     port->data_ = std::move(data);
@@ -746,11 +740,6 @@ MaybeLocal<Object> AdoptPort(Local<Context> context,
   return port->Wrapper(v8::Isolate::GetCurrent());
 }
 
-bool AnyPortsOrBrands(Isolate* isolate) {
-  MessagingState* state = State(isolate);
-  return state != nullptr && state->claimHostObjects;
-}
-
 Maybe<bool> IsMarkedUntransferable(Isolate* isolate, Local<Object> object) {
   Local<Private> brand = UntransferableBrand(isolate, false);
   if (brand.IsEmpty()) {

NativeScript/runtime/Messaging.h

@@ -181,11 +181,6 @@ bool IsPortWrapper(v8::Isolate* isolate, v8::Local<v8::Object> object);
 v8::MaybeLocal<v8::Object> AdoptPort(v8::Local<v8::Context> context,
                                      std::unique_ptr<PortData> data);
 
-// Whether this isolate has ever created a port or stamped a transfer brand.
-// Gates the serializer's host-object claim: until one of those happens, no
-// value in this isolate can need the messaging hooks.
-bool AnyPortsOrBrands(v8::Isolate* isolate);
-
 // The markAsUntransferable / markAsUncloneable brands. Both answer Just(false)
 // without creating anything when this isolate has never stamped one.
 v8::Maybe<bool> IsMarkedUntransferable(v8::Isolate* isolate,