Revert of New task queueing primitive for async tasks: TaskQueue.

webrtc/base/task_queue_posix.cc

Index: webrtc/base/task_queue_posix.cc
diff --git a/webrtc/base/task_queue_posix.cc b/webrtc/base/task_queue_posix.cc
deleted file mode 100644
index 3b00ac8e12d03adbf9d05e4f3d093aadd5d7e60f..0000000000000000000000000000000000000000
--- a/webrtc/base/task_queue_posix.cc
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include "webrtc/base/task_queue_posix.h"
-
-#include "webrtc/base/checks.h"
-#include "webrtc/base/task_queue.h"
-
-namespace rtc {
-namespace internal {
-pthread_key_t g_queue_ptr_tls = 0;
-
-void InitializeTls() {
-  RTC_CHECK(pthread_key_create(&g_queue_ptr_tls, nullptr) == 0);
-}
-
-pthread_key_t GetQueuePtrTls() {
-  static pthread_once_t init_once = PTHREAD_ONCE_INIT;
-  RTC_CHECK(pthread_once(&init_once, &InitializeTls) == 0);
-  return g_queue_ptr_tls;
-}
-
-AutoSetCurrentQueuePtr::AutoSetCurrentQueuePtr(TaskQueue* q)
-    : prev_(TaskQueue::Current()) {
-  pthread_setspecific(GetQueuePtrTls(), q);
-}
-
-AutoSetCurrentQueuePtr::~AutoSetCurrentQueuePtr() {
-  pthread_setspecific(GetQueuePtrTls(), prev_);
-}
-
-}  // namespace internal
-}  // namespace rtc