Deletes base::MessageLoop::set_thread_name().

ios/web/app/web_main_loop.mm

 // 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.
 
 #include "ios/web/app/web_main_loop.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 236 matching lines @@
   WebThreadImpl::ShutdownThreadPool();
 
   URLDataManagerIOS::DeleteDataSources();
 
   if (parts_) {
     parts_->PostDestroyThreads();
   }
 }
 
 void WebMainLoop::InitializeMainThread() {
-  const char* kThreadName = "CrWebMain";
-  base::PlatformThread::SetName(kThreadName);
-  if (main_message_loop_) {
-    main_message_loop_->set_thread_name(kThreadName);
-  }
+  base::PlatformThread::SetName("CrWebMain");
 
   // Register the main thread by instantiating it, but don't call any methods.
   main_thread_.reset(
       new WebThreadImpl(WebThread::UI, base::MessageLoop::current()));
 }
 
 int WebMainLoop::WebThreadsStarted() {
   cookie_notification_bridge_.reset(new CookieNotificationBridge);
   return result_code_;
 }
 
 }  // namespace web