src: annotate BaseObjects in the heap snapshots correctly

This fixes two issues in the BaseObject views in the heap snapshots:

1. BaseObjects are not conceptually roots when the environment and
   the realms are also showing up in the heap snapshot. Rather, they
   should be considered being held alive by the BaseObjectList in
   the realms, which are in turn held alive by Environment. The
   actual root from the containment view should be the Environment
   instead.
2. The concept of DOM detaching does not really apply to Node.js
   wrappers, and it's confusing to connect that with the weakness
   or detachment (native weakness) of BaseObjects. To avoid the
   confusion, just restore to the default detachedness for them.

PR-URL: #57417
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

Author: joyeecheung

src/base_object-inl.h

@@ -125,11 +125,6 @@ bool BaseObject::IsWeakOrDetached() const {
   return pd->wants_weak_jsobj || pd->is_detached;
 }
 
-v8::EmbedderGraph::Node::Detachedness BaseObject::GetDetachedness() const {
-  return IsWeakOrDetached() ? v8::EmbedderGraph::Node::Detachedness::kDetached
-                            : v8::EmbedderGraph::Node::Detachedness::kUnknown;
-}
-
 template <int Field>
 void BaseObject::InternalFieldGet(
     const v8::FunctionCallbackInfo<v8::Value>& args) {

src/base_object.cc

@@ -163,10 +163,6 @@ Local<Object> BaseObject::WrappedObject() const {
   return object();
 }
 
-bool BaseObject::IsRootNode() const {
-  return !persistent_handle_.IsWeak();
-}
-
 bool BaseObject::IsNotIndicativeOfMemoryLeakAtExit() const {
   return IsWeakOrDetached();
 }

src/base_object.h

@@ -99,8 +99,6 @@ class BaseObject : public MemoryRetainer {
   // to it anymore.
   inline bool IsWeakOrDetached() const;
 
-  inline v8::EmbedderGraph::Node::Detachedness GetDetachedness() const override;
-
   // Utility to create a FunctionTemplate with one internal field (used for
   // the `BaseObject*` pointer) and a constructor that initializes that field
   // to `nullptr`.
@@ -186,7 +184,6 @@ class BaseObject : public MemoryRetainer {
 
  private:
   v8::Local<v8::Object> WrappedObject() const override;
-  bool IsRootNode() const override;
   static void DeleteMe(void* data);
 
   // persistent_handle_ needs to be at a fixed offset from the start of the