Use TaskScheduler::InitParams to initialize TaskScheduler in web_main_loop.mm.

ios/chrome/browser/web/chrome_web_client.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IOS_CHROME_BROWSER_WEB_CHROME_WEB_CLIENT_H_
 #define IOS_CHROME_BROWSER_WEB_CHROME_WEB_CLIENT_H_
 
 #include "base/macros.h"
 #include "ios/web/public/web_client.h"
 
@@ skipping 24 matching lines @@
   void PostBrowserURLRewriterCreation(
       web::BrowserURLRewriter* rewriter) override;
   NSString* GetEarlyPageScript(web::BrowserState* browser_state) const override;
   void AllowCertificateError(
       web::WebState* web_state,
       int cert_error,
       const net::SSLInfo& ssl_info,
       const GURL& request_url,
       bool overridable,
       const base::Callback<void(bool)>& callback) override;
-  void GetTaskSchedulerInitializationParams(
-      std::vector<base::SchedulerWorkerPoolParams>* params_vector,
-      base::TaskScheduler::WorkerPoolIndexForTraitsCallback*
-          index_to_traits_callback) override;
+  std::unique_ptr<base::TaskScheduler::InitParams> GetTaskSchedulerInitParams()
+      override;
   void PerformExperimentalTaskSchedulerRedirections() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ChromeWebClient);
 };
 
 #endif  // IOS_CHROME_BROWSER_WEB_CHROME_WEB_CLIENT_H_