test: remove useless WPT init scripts

PR-URL: #46801
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

Author: panva

test/wpt/test-blob.js

@@ -4,11 +4,4 @@ const { WPTRunner } = require('../common/wpt');
 
 const runner = new WPTRunner('FileAPI/blob');
 
-runner.setInitScript(`
-  const { Blob } = require('buffer');
-  const { ReadableStream } = require('stream/web');
-  global.Blob = Blob;
-  global.ReadableStream = ReadableStream;
-`);
-
 runner.runJsTests();

test/wpt/test-broadcastchannel.js

@@ -4,9 +4,4 @@ const { WPTRunner } = require('../common/wpt');
 
 const runner = new WPTRunner('webmessaging/broadcastchannel');
 
-runner.setInitScript(`
-  const { BroadcastChannel } = require('worker_threads');
-  global.BroadcastChannel = BroadcastChannel;
-`);
-
 runner.runJsTests();

test/wpt/test-encoding.js

@@ -3,9 +3,4 @@
 const { WPTRunner } = require('../common/wpt');
 const runner = new WPTRunner('encoding');
 
-runner.setInitScript(`
-  const { MessageChannel } = require('worker_threads');
-  global.MessageChannel = MessageChannel;
-`);
-
 runner.runJsTests();