Revert of Remove all reference to carbon api

webrtc/media/BUILD.gn

 # Copyright (c) 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.
 
 import("//build/config/linux/pkg_config.gni")
 import("../build/webrtc.gni")
@@ skipping 173 matching lines @@
     sources += [
       "devices/gdivideorenderer.cc",
       "devices/gdivideorenderer.h",
     ]
     libs += [
       "d3d9.lib",
       "gdi32.lib",
       "strmiids.lib",
     ]
   }
+  if (is_mac && current_cpu == "x86") {
+    sources += [
+      "devices/carbonvideorenderer.cc",
+      "devices/carbonvideorenderer.h",
+    ]
+    libs += [ "Carbon.framework" ]
+  }
+  if (is_ios || (is_mac && current_cpu != "x86")) {
+    defines += [ "CARBON_DEPRECATED=YES" ]
+  }
+
   deps += [
     "..:webrtc_common",
     "../base:rtc_base_approved",
     "../call",
     "../libjingle/xmllite",
     "../libjingle/xmpp",
     "../modules/video_coding",
     "../p2p",
     "../system_wrappers",
     "../video",
@@ skipping 173 matching lines @@
     deps += [
       # TODO(kjellander): Move as part of work in bugs.webrtc.org/4243.
       ":rtc_media",
       ":rtc_unittest_main",
       "../audio",
       "../base:rtc_base_tests_utils",
       "../system_wrappers:metrics_default",
     ]
   }
 }