Delete GlobalTaskQueueFactory as now unused

Bug: webrtc:10284
Change-Id: I80fd75b0bd306a26e0c022047551587ee5fd08cd
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/144781
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28516}

BUILD.gn

@@ -480,7 +480,6 @@ if (rtc_include_tests) {
       "api:rtc_api_unittests",
       "api/audio/test:audio_api_unittests",
       "api/audio_codecs/test:audio_codecs_api_unittests",
-      "api/task_queue:global_task_queue_factory",
       "api/video/test:rtc_api_video_unittests",
       "api/video_codecs/test:video_codecs_api_unittests",
       "call:fake_network_pipe_unittests",

api/task_queue/BUILD.gn

@@ -84,25 +84,3 @@ if (rtc_include_tests) {
     ]
   }
 }
-
-rtc_source_set("global_task_queue_factory") {
-  # TODO(bugs.webrtc.org/10284): Remove this target when task queue factory
-  # propagated to all components that create TaskQueues.
-  visibility = [ "*" ]
-  sources = [
-    "global_task_queue_factory.cc",
-    "global_task_queue_factory.h",
-  ]
-  deps = [
-    ":task_queue",
-    "../../rtc_base:checks",
-  ]
-
-  if (build_with_chromium) {
-    # Chromium uses link-time injection of the CreateDefaultTaskQueueFactory
-    deps += [ "../../../webrtc_overrides:task_queue_impl" ]
-    sources += [ "default_task_queue_factory.h" ]
-  } else {
-    deps += [ ":default_task_queue_factory" ]
-  }
-}

api/task_queue/global_task_queue_factory.cc

@@ -1,40 +0,0 @@
-/*
- *  Copyright 2019 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 "api/task_queue/global_task_queue_factory.h"
-
-#include "api/task_queue/default_task_queue_factory.h"
-#include "rtc_base/checks.h"
-
-namespace webrtc {
-namespace {
-
-TaskQueueFactory* GlobalOrDefault(TaskQueueFactory* global) {
-  static TaskQueueFactory* const factory =
-      global ? global : CreateDefaultTaskQueueFactory().release();
-  return factory;
-}
-
-}  // namespace
-
-void SetGlobalTaskQueueFactory(std::unique_ptr<TaskQueueFactory> factory) {
-  RTC_CHECK(factory) << "Can't set nullptr TaskQueueFactory";
-  // Own, but never delete the global factory.
-  TaskQueueFactory* global = factory.release();
-  RTC_CHECK(GlobalOrDefault(global) == global)
-      << "Task queue factory set after another SetFactory or after a task "
-         "queue was created";
-}
-
-TaskQueueFactory& GlobalTaskQueueFactory() {
-  return *GlobalOrDefault(nullptr);
-}
-
-}  // namespace webrtc

api/task_queue/global_task_queue_factory.h

@@ -1,27 +0,0 @@
-/*
- *  Copyright 2019 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.
- */
-#ifndef API_TASK_QUEUE_GLOBAL_TASK_QUEUE_FACTORY_H_
-#define API_TASK_QUEUE_GLOBAL_TASK_QUEUE_FACTORY_H_
-
-#include <memory>
-
-#include "api/task_queue/task_queue_factory.h"
-
-namespace webrtc {
-
-// May be called at most once, and before any TaskQueue is created.
-void SetGlobalTaskQueueFactory(std::unique_ptr<TaskQueueFactory> factory);
-
-// Returns TaskQueue factory. Always returns the same factory.
-TaskQueueFactory& GlobalTaskQueueFactory();
-
-}  // namespace webrtc
-
-#endif  // API_TASK_QUEUE_GLOBAL_TASK_QUEUE_FACTORY_H_

modules/video_coding/BUILD.gn

@@ -153,7 +153,6 @@ rtc_static_library("video_coding") {
     "..:module_api_public",
     "../../api:fec_controller_api",
     "../../api:rtp_headers",
-    "../../api/task_queue:global_task_queue_factory",
     "../../api/units:data_rate",
     "../../api/video:builtin_video_bitrate_allocator_factory",
     "../../api/video:encoded_frame",

sdk/BUILD.gn

@@ -232,7 +232,6 @@ if (is_ios || is_mac) {
 
         deps = [
           ":audio_device",
-          "../api/task_queue:global_task_queue_factory",
           "../modules/audio_device:audio_device_api",
           "../modules/audio_device:audio_device_generic",
           "../rtc_base:checks",