Use ffmpeg_features buildflags

media/ffmpeg/BUILD.gn

 # Copyright 2016 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("//media/media_options.gni")
 
 assert(media_use_ffmpeg)
 
 source_set("ffmpeg") {
   visibility = [ "//media/*" ]
   allow_circular_includes_from = [ "//media/base" ]
   configs += [ "//media/base:base_config" ]
   sources = [
     "ffmpeg_common.cc",
     "ffmpeg_common.h",
     "ffmpeg_deleters.h",
   ]
   deps = [
     "//base",
     "//media:media_features",
     "//media:shared_memory_support",
     "//media/base",
     "//third_party/ffmpeg",
+    "//third_party/ffmpeg:ffmpeg_features",
   ]
 }
 
 source_set("ffmpeg_unittests") {
   testonly = true
   sources = [
     "ffmpeg_common_unittest.cc",
   ]
   deps = [
     "//base",
@@ skipping 10 matching lines @@
     "ffmpeg_regression_tests.cc",
   ]
   deps = [
     "//base",
     "//media",
     "//media/test:pipeline_integration_test_base",
     "//testing/gmock",
     "//third_party/ffmpeg",
   ]
 }