perf_hooks: remove unnecessary bind

Pass through parameters using setImmediate rather
than using Function.prototype.bind to bind the
provided context.

lib/perf_hooks.js

@@ -463,11 +463,14 @@ function getObserversList(type) {
   return list;
 }
 
-function doNotify() {
-  this[kQueued] = false;
-  this.runInAsyncScope(this[kCallback], this, this[kBuffer], this);
-  this[kBuffer][kEntries] = [];
-  L.init(this[kBuffer][kEntries]);
+function doNotify(observer) {
+  observer[kQueued] = false;
+  observer.runInAsyncScope(observer[kCallback],
+                           observer,
+                           observer[kBuffer],
+                           observer);
+  observer[kBuffer][kEntries] = [];
+  L.init(observer[kBuffer][kEntries]);
 }
 
 // Set up the callback used to receive PerformanceObserver notifications
@@ -493,11 +496,11 @@ function observersCallback(entry) {
         observer[kQueued] = true;
         // Use setImmediate instead of nextTick to give more time
         // for multiple entries to collect.
-        setImmediate(doNotify.bind(observer));
+        setImmediate(doNotify, observer);
       }
     } else {
       // If not buffering, notify immediately
-      doNotify.call(observer);
+      doNotify(observer);
     }
     current = current._idlePrev;
   }