[rename] Rename internal field to embedder field.

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 4ab7af6d2c7fedd22e61b098b0d2038285d0f3d2..4f75a20c9fde691c38fad63f6f51cc2fe9207d23 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -227,7 +227,6 @@ static Local<Value> Throw(Isolate* isolate, const char* message) {
           .ToLocalChecked());
 }
 
-
 Worker* GetWorkerFromInternalField(Isolate* isolate, Local<Object> object) {
   if (object->InternalFieldCount() != 1) {
     Throw(isolate, "this is not a Worker");
@@ -1148,7 +1147,7 @@ void Shell::WorkerNew(const v8::FunctionCallbackInfo<v8::Value>& args) {
       return;
     }
 
-    // Initialize the internal field to NULL; if we return early without
+    // Initialize the embedder field to NULL; if we return early without
     // creating a new Worker (because the main thread is terminating) we can
     // early-out from the instance calls.
     args.Holder()->SetAlignedPointerInInternalField(0, NULL);