http: remove unused hasItems() from freelist

Remove the hasItems() method from freelist module as it is unused
internally.

PR-URL: #30744
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Weijia Wang <starkwang@126.com>

lib/internal/freelist.js

@@ -12,10 +12,6 @@ class FreeList {
     this.list = [];
   }
 
-  hasItems() {
-    return this.list.length > 0;
-  }
-
   alloc() {
     return this.list.length > 0 ?
       this.list.pop() :

test/parallel/test-freelist.js

@@ -28,13 +28,3 @@ assert.strictEqual(flist1.free({ id: 'test5' }), false);
 assert.strictEqual(flist1.alloc().id, 'test3');
 assert.strictEqual(flist1.alloc().id, 'test2');
 assert.strictEqual(flist1.alloc().id, 'test1');
-
-// Check list has elements
-const flist2 = new FreeList('flist2', 2, Object);
-assert.strictEqual(flist2.hasItems(), false);
-
-flist2.free({ id: 'test1' });
-assert.strictEqual(flist2.hasItems(), true);
-
-flist2.alloc();
-assert.strictEqual(flist2.hasItems(), false);