Merge pull request #9405 from Snuffleupagus/pr-9245-followup

Re-factor resetting of `StatTimer` instances to fix completely broken benchmarking (PR 9245 follow-up)

src/display/api.js

@@ -1056,8 +1056,8 @@ var PDFPageProxy = (function PDFPageProxyClosure() {
       }, this);
       this.objs.clear();
       this.annotationsPromise = null;
-      if (resetStats) {
-        this._stats.reset();
+      if (resetStats && this._stats instanceof StatTimer) {
+        this._stats = new StatTimer();
       }
       this.pendingCleanup = false;
     },

src/display/dom_utils.js

@@ -411,10 +411,6 @@ function isExternalLinkTargetSet() {
 class StatTimer {
   constructor(enable = true) {
     this.enabled = !!enable;
-    this.reset();
-  }
-
-  reset() {
     this.started = Object.create(null);
     this.times = [];
   }
@@ -477,8 +473,6 @@ class DummyStatTimer {
     unreachable('Cannot initialize DummyStatTimer.');
   }
 
-  static reset() {}
-
   static time(name) {}
 
   static timeEnd(name) {}