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

ios/web/public/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_WEB_PUBLIC_WEB_CLIENT_H_
 #define IOS_WEB_PUBLIC_WEB_CLIENT_H_
 
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_piece.h"
 #include "base/task_scheduler/task_scheduler.h"
 #include "ios/web/public/user_agent.h"
 #include "ui/base/layout.h"
 #include "url/url_util.h"
 
 namespace base {
 class RefCountedMemory;
-class SchedulerWorkerPoolParams;
 }
 
 class GURL;
 
 @class UIWebView;
 @class NSString;
 
 namespace net {
 class SSLInfo;
 }
@@ skipping 86 matching lines @@
   // embedder can call the |callback| asynchronously (an argument of true means
   // that |cert_error| should be ignored and web// should load the page).
   virtual void AllowCertificateError(
       WebState* web_state,
       int cert_error,
       const net::SSLInfo& ssl_info,
       const GURL& request_url,
       bool overridable,
       const base::Callback<void(bool)>& callback);
 
-  // Provides parameters for initializing the global task scheduler. If
-  // |params_vector| is empty, default parameters are used.
-  virtual void GetTaskSchedulerInitializationParams(
-      std::vector<base::SchedulerWorkerPoolParams>* params_vector,
-      base::TaskScheduler::WorkerPoolIndexForTraitsCallback*
-          index_to_traits_callback) {}
+  // Provides parameters for initializing the global task scheduler. Default
+  // params are used if this returns nullptr.
+  virtual std::unique_ptr<base::TaskScheduler::InitParams>
+  GetTaskSchedulerInitParams();
 
   // Performs any necessary PostTask API redirection to the task scheduler.
   virtual void PerformExperimentalTaskSchedulerRedirections() {}
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_WEB_CLIENT_H_