Rename is_chromeos in chrome/src.

media/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/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/features.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
@@ skipping 349 matching lines @@
       "//media/base/android:video_capture_jni_headers",
     ]
     allow_circular_includes_from = [ "//media/base/android" ]
   } else {
     sources += [
       "filters/opus_audio_decoder.cc",
       "filters/opus_audio_decoder.h",
     ]
   }
 
-  if (current_cpu != "arm" && is_chromeos) {
+  if (current_cpu != "arm" && use_cros_fe) {
     sources += [
       "filters/h264_bitstream_buffer.cc",
       "filters/h264_bitstream_buffer.h",
     ]
   }
 
   # A simple WebM encoder for animated avatars on ChromeOS.
 
   if (use_ozone) {
     # Used for the generated listing header (ui/ozone/platform_list.h)
@@ skipping 256 matching lines @@
       "filters/audio_decoder_unittest.cc",
       "filters/audio_file_reader_unittest.cc",
       "filters/blocking_url_protocol_unittest.cc",
       "filters/ffmpeg_demuxer_unittest.cc",
       "filters/ffmpeg_glue_unittest.cc",
       "filters/ffmpeg_video_decoder_unittest.cc",
       "filters/in_memory_url_protocol_unittest.cc",
     ]
   }
 
-  if (current_cpu != "arm" && is_chromeos) {
+  if (current_cpu != "arm" && use_cros_fe) {
     sources += [ "filters/h264_bitstream_buffer_unittest.cc" ]
   }
 
   if (proprietary_codecs) {
     sources += [
       "cdm/cenc_utils_unittest.cc",
       "filters/h264_to_annex_b_bitstream_converter_unittest.cc",
       "formats/common/stream_parser_test_base.cc",
       "formats/common/stream_parser_test_base.h",
       "formats/mp2t/es_adapter_video_unittest.cc",
@@ skipping 141 matching lines @@
       "//media/base:test_support",
       "//media/test:pipeline_integration_tests",
       "//testing/gmock",
       "//testing/gtest",
       "//third_party/ffmpeg",
       "//ui/gfx/geometry",
       "//ui/gfx:test_support",
     ]
   }
 }