Update from https://crrev.com/320343

base/threading/worker_pool_posix.cc

 // Copyright (c) 2012 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 "base/threading/worker_pool_posix.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread_local.h"
 #include "base/threading/worker_pool.h"
 #include "base/trace_event/trace_event.h"
 #include "base/tracked_objects.h"
 
 using tracked_objects::TrackedTime;
 
 namespace base {
 
 namespace {
 
 base::LazyInstance<ThreadLocalBoolean>::Leaky
     g_worker_pool_running_on_this_thread = LAZY_INSTANCE_INITIALIZER;
 
 const int kIdleSecondsBeforeExit = 10 * 60;
 
-#ifdef ADDRESS_SANITIZER
-const int kWorkerThreadStackSize = 256 * 1024;
-#else
-// A stack size of 64 KB is too small for the CERT_PKIXVerifyCert
-// function of NSS because of NSS bug 439169.
-const int kWorkerThreadStackSize = 128 * 1024;
-#endif
-
 class WorkerPoolImpl {
  public:
   WorkerPoolImpl();
   ~WorkerPoolImpl();
 
   void PostTask(const tracked_objects::Location& from_here,
                 const base::Closure& task, bool task_is_slow);
 
  private:
   scoped_refptr<base::PosixDynamicThreadPool> pool_;
@@ skipping 113 matching lines @@
   pending_task->task.Reset();
 
   // We have enough worker threads.
   if (static_cast<size_t>(num_idle_threads_) >= pending_tasks_.size()) {
     pending_tasks_available_cv_.Signal();
   } else {
     // The new PlatformThread will take ownership of the WorkerThread object,
     // which will delete itself on exit.
     WorkerThread* worker =
         new WorkerThread(name_prefix_, this);
-    PlatformThread::CreateNonJoinable(kWorkerThreadStackSize, worker);
+    PlatformThread::CreateNonJoinable(0, worker);
   }
 }
 
 PendingTask PosixDynamicThreadPool::WaitForTask() {
   AutoLock locked(lock_);
 
   if (terminated_)
     return PendingTask(FROM_HERE, base::Closure());
 
   if (pending_tasks_.empty()) {  // No work available, wait for work.
@@ skipping 11 matching lines @@
       return PendingTask(FROM_HERE, base::Closure());
     }
   }
 
   PendingTask pending_task = pending_tasks_.front();
   pending_tasks_.pop();
   return pending_task;
 }
 
 }  // namespace base