Bump to WebRTC M131 release

Ongoing fixes and improvements, transient suppressor is gone. Also,
dropping isac because it doesn't seem to be useful, and is just build
system deadweight now.

Upstream references:

  Version: 131.0.6778.200
  WebRTC: 79aff54b0fa9238ce3518dd9eaf9610cd6f22e82
  Chromium: 2a19506ad24af755f2a215a4c61f775393e0db42

webrtc/api/task_queue/queued_task.h

@@ -1,32 +0,0 @@
-/*
- *  Copyright 2018 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_QUEUED_TASK_H_
-#define API_TASK_QUEUE_QUEUED_TASK_H_
-
-namespace webrtc {
-
-// Base interface for asynchronously executed tasks.
-// The interface basically consists of a single function, Run(), that executes
-// on the target queue.  For more details see the Run() method and TaskQueue.
-class QueuedTask {
- public:
-  virtual ~QueuedTask() = default;
-
-  // Main routine that will run when the task is executed on the desired queue.
-  // The task should return |true| to indicate that it should be deleted or
-  // |false| to indicate that the queue should consider ownership of the task
-  // having been transferred.  Returning |false| can be useful if a task has
-  // re-posted itself to a different queue or is otherwise being re-used.
-  virtual bool Run() = 0;
-};
-
-}  // namespace webrtc
-
-#endif  // API_TASK_QUEUE_QUEUED_TASK_H_

webrtc/api/task_queue/task_queue_base.cc

@@ -11,9 +11,6 @@
 
 #include "absl/base/attributes.h"
 #include "absl/base/config.h"
-#include "absl/functional/any_invocable.h"
-#include "api/units/time_delta.h"
-#include "rtc_base/checks.h"
 
 #if defined(ABSL_HAVE_THREAD_LOCAL)
 

webrtc/api/task_queue/task_queue_base.h

@@ -10,7 +10,6 @@
 #ifndef API_TASK_QUEUE_TASK_QUEUE_BASE_H_
 #define API_TASK_QUEUE_TASK_QUEUE_BASE_H_
 
-#include <memory>
 #include <utility>
 
 #include "absl/functional/any_invocable.h"