Update TaskTraits in browser_main_loop.cc.

content/browser/browser_main_loop.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 "content/browser/browser_main_loop.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 993 matching lines @@
        thread_id < BrowserThread::ID_COUNT;
        ++thread_id) {
     // If this thread ID is backed by a real thread, |thread_to_start| will be
     // set to the appropriate BrowserProcessSubThread*. And |options| can be
     // updated away from its default.
     std::unique_ptr<BrowserProcessSubThread>* thread_to_start = nullptr;
     base::Thread::Options options;
 
     // Otherwise this thread ID will be backed by a SingleThreadTaskRunner using
     // |non_ui_non_io_task_runner_traits| (which can be augmented below).
-    // TODO(gab): Existing non-UI/non-IO BrowserThreads allow waiting so the
-    // initial redirection will as well but they probably don't need to.
+    // TODO(gab): Existing non-UI/non-IO BrowserThreads allow sync primitives so
+    // the initial redirection will as well but they probably don't need to.
     base::TaskTraits non_ui_non_io_task_runner_traits =
-        base::TaskTraits().WithFileIO().WithWait();
+        base::TaskTraits().MayBlock().WithSyncPrimitives();
 
     switch (thread_id) {
       case BrowserThread::DB:
         TRACE_EVENT_BEGIN1("startup",
             "BrowserMainLoop::CreateThreads:start",
             "Thread", "BrowserThread::DB");
         if (redirect_nonUInonIO_browser_threads) {
           non_ui_non_io_task_runner_traits
               .WithPriority(base::TaskPriority::USER_VISIBLE)
               .WithShutdownBehavior(base::TaskShutdownBehavior::BLOCK_SHUTDOWN);
@@ skipping 765 matching lines @@
   if (!audio_manager_) {
     audio_thread_ = base::MakeUnique<AudioManagerThread>();
     audio_manager_ = media::AudioManager::Create(
         audio_thread_->task_runner(), audio_thread_->worker_task_runner(),
         MediaInternals::GetInstance());
   }
   CHECK(audio_manager_);
 }
 
 }  // namespace content