Ensures that audio tasks cannot run after AudioManager is deleted.

content/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//gpu/vulkan/features.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
@@ skipping 336 matching lines @@
     "appcache/appcache_url_loader_request.cc",
     "appcache/appcache_url_loader_request.h",
     "appcache/appcache_url_request.cc",
     "appcache/appcache_url_request.h",
     "appcache/appcache_url_request_job.cc",
     "appcache/appcache_url_request_job.h",
     "appcache/appcache_working_set.cc",
     "appcache/appcache_working_set.h",
     "appcache/chrome_appcache_service.cc",
     "appcache/chrome_appcache_service.h",
-    "audio_manager_thread.cc",
-    "audio_manager_thread.h",
     "background_fetch/background_fetch_context.cc",
     "background_fetch/background_fetch_context.h",
     "background_fetch/background_fetch_cross_origin_filter.cc",
     "background_fetch/background_fetch_cross_origin_filter.h",
     "background_fetch/background_fetch_data_manager.cc",
     "background_fetch/background_fetch_data_manager.h",
     "background_fetch/background_fetch_event_dispatcher.cc",
     "background_fetch/background_fetch_event_dispatcher.h",
     "background_fetch/background_fetch_job_controller.cc",
     "background_fetch/background_fetch_job_controller.h",
@@ skipping 1781 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }