Revert "perf_hooks: make PerformanceObserver an AsyncResource"

This reverts commit 009e418.

AFAIU the discussion at [1], PerformanceObserver had been made to
inherit from AsyncResource more or less as a band-aid in lack of a
better async_context candidate to invoke it in. In order to enable
access to AsyncLocalStores from PerformanceObservers invoked
synchronously through e.g. measure() or mark(), the current
async_context, if any, should be retained.

Note that this is a breaking change, but
- as has been commented at [1], PerformanceObserver being derived from
  AsyncResource is a "minor divergence from the spec" anyway,
- to my knowledge this is an internal implementation detail which has
  never been documented and
- I can't think of a good reason why existing PerformanceObserver
  implementations would possibly rely on it.

OTOH, it's probably worthwhile to not potentially invoke before() and
after() async_hooks for each and every PerformanceObserver notification.

[1] #18789

Co-Authored-By: ZauberNerd <zaubernerd@zaubernerd.de>

PR-URL: #36343
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>

lib/perf_hooks.js

@@ -52,7 +52,6 @@ const {
   NODE_PERFORMANCE_MILESTONE_ENVIRONMENT
 } = constants;
 
-const { AsyncResource } = require('async_hooks');
 const L = require('internal/linkedlist');
 const kInspect = require('internal/util').customInspectSymbol;
 
@@ -340,12 +339,11 @@ class PerformanceObserverEntryList {
   }
 }
 
-class PerformanceObserver extends AsyncResource {
+class PerformanceObserver {
   constructor(callback) {
     if (typeof callback !== 'function') {
       throw new ERR_INVALID_CALLBACK(callback);
     }
-    super('PerformanceObserver');
     ObjectDefineProperties(this, {
       [kTypes]: {
         enumerable: false,
@@ -553,10 +551,7 @@ function getObserversList(type) {
 
 function doNotify(observer) {
   observer[kQueued] = false;
-  observer.runInAsyncScope(observer[kCallback],
-                           observer,
-                           observer[kBuffer],
-                           observer);
+  observer[kCallback](observer[kBuffer], observer);
   observer[kBuffer][kEntries] = [];
   L.init(observer[kBuffer][kEntries]);
 }