Convert enable_mpeg2ts into a new-style buildflag

content/test/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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build_overrides/v8.gni")
 import("//media/media_options.gni")
@@ skipping 358 matching lines @@
     "//content/public/renderer",
     "//content/shell:content_shell_lib",
     "//content/shell:pak",
     "//content/test:test_support",
     "//device/battery",
     "//device/battery:mojo_bindings",
     "//device/vibration:mojo_bindings",
     "//gin",
     "//gpu",
     "//ipc:test_support",
+    "//media:media_features",
     "//media:shared_memory_support",
     "//media:test_support",
     "//media/audio:test_support",
     "//media/base:test_support",
     "//mojo/application/public/cpp:cpp_for_chromium",
     "//mojo/environment:chromium",
     "//mojo/public/cpp/bindings",
     "//mojo/public/js",
     "//mojo/test:test_support",
     "//net:test_support",
@@ skipping 509 matching lines @@
       deps += [
         "//gpu:test_support",
         "//media/base/android",
         "//media/base/android:media_java",
         "//testing/gmock",
         "//ui/android:ui_java",
       ]
     }
   }
 }