Remove TaskScheduler::CreateAndSetSimpleTaskScheduler().

components/cronet/ios/cronet_environment.mm

 // Copyright 2016 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 "components/cronet/ios/cronet_environment.h"
 
 #include <utility>
 
 #include "base/at_exit.h"
 #include "base/atomicops.h"
@@ skipping 100 matching lines @@
   return main_context_getter_.get();
 }
 
 // static
 void CronetEnvironment::Initialize() {
   // DCHECK_EQ([NSThread currentThread], [NSThread mainThread]);
   // This method must be called once from the main thread.
   if (!g_at_exit_)
     g_at_exit_ = new base::AtExitManager;
 
-  base::TaskScheduler::CreateAndSetSimpleTaskScheduler("CronetIos");
+  base::TaskScheduler::CreateAndStartWithDefaultParams("CronetIos");
 
   url::Initialize();
   base::CommandLine::Init(0, nullptr);
 
   // Without doing this, StatisticsRecorder::FactoryGet() leaks one histogram
   // per call after the first for a given name.
   base::StatisticsRecorder::Initialize();
 
   // Create a message loop on the UI thread.
   DCHECK(!base::MessageLoop::current());
@@ skipping 239 matching lines @@
   event->Signal();
 }
 
 std::string CronetEnvironment::getDefaultQuicUserAgentId() const {
   return base::SysNSStringToUTF8([[NSBundle mainBundle]
              objectForInfoDictionaryKey:@"CFBundleDisplayName"]) +
          " Cronet/" + CRONET_VERSION;
 }
 
 }  // namespace cronet