Remove voe::OutputMixer and AudioConferenceMixer.

modules/audio_conference_mixer/BUILD.gn

Index: modules/audio_conference_mixer/BUILD.gn
diff --git a/modules/audio_conference_mixer/BUILD.gn b/modules/audio_conference_mixer/BUILD.gn
deleted file mode 100644
index 16a62b827401330bc9519766d25032d7232dbc05..0000000000000000000000000000000000000000
--- a/modules/audio_conference_mixer/BUILD.gn
+++ /dev/null
@@ -1,80 +0,0 @@
-# Copyright (c) 2014 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.
-
-import("../../webrtc.gni")
-
-config("audio_conference_mixer_config") {
-  visibility = [ ":*" ]  # Only targets in this file can depend on this.
-  include_dirs = [
-    "include",
-    "../include",
-  ]
-}
-
-rtc_static_library("audio_conference_mixer") {
-  sources = [
-    "include/audio_conference_mixer.h",
-    "include/audio_conference_mixer_defines.h",
-    "source/audio_conference_mixer_impl.cc",
-    "source/audio_conference_mixer_impl.h",
-    "source/audio_frame_manipulator.cc",
-    "source/audio_frame_manipulator.h",
-    "source/memory_pool.h",
-    "source/memory_pool_posix.h",
-    "source/memory_pool_win.h",
-    "source/time_scheduler.cc",
-    "source/time_scheduler.h",
-  ]
-
-  public_configs = [ ":audio_conference_mixer_config" ]
-
-  if (!build_with_chromium && is_clang) {
-    # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
-    suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
-  }
-
-  deps = [
-    "..:module_api",
-    "../..:webrtc_common",
-    "../../audio/utility:audio_frame_operations",
-    "../../rtc_base:rtc_base_approved",
-    "../../system_wrappers",
-    "../audio_processing",
-  ]
-}
-
-if (rtc_include_tests) {
-  rtc_source_set("audio_conference_mixer_unittests") {
-    testonly = true
-
-    # Skip restricting visibility on mobile platforms since the tests on those
-    # gets additional generated targets which would require many lines here to
-    # cover (which would be confusing to read and hard to maintain).
-    if (!is_android && !is_ios) {
-      visibility = [ "..:modules_unittests" ]
-    }
-    sources = [
-      "test/audio_conference_mixer_unittest.cc",
-    ]
-    deps = [
-      ":audio_conference_mixer",
-      "../../test:test_support",
-      "//testing/gmock",
-    ]
-    if (is_win) {
-      cflags = [
-        # TODO(kjellander): bugs.webrtc.org/261: Fix this warning.
-        "/wd4373",  # virtual function override.
-      ]
-    }
-    if (!build_with_chromium && is_clang) {
-      # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
-      suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
-    }
-  }
-}