diff -up chromium-63.0.3239.84/third_party/ffmpeg/ffmpeg_generated.gni.aarch64 chromium-63.0.3239.84/third_party/ffmpeg/ffmpeg_generated.gni
--- chromium-63.0.3239.84/third_party/ffmpeg/ffmpeg_generated.gni.aarch64	2017-12-07 11:23:07.077290535 -0500
+++ chromium-63.0.3239.84/third_party/ffmpeg/ffmpeg_generated.gni	2017-12-07 11:27:30.354175021 -0500
@@ -541,7 +541,7 @@ if (use_linux_config && current_cpu == "
   ]
 }
 
-if ((is_android && current_cpu == "arm64" && ffmpeg_branding == "Chrome") || (use_linux_config && current_cpu == "arm64" && ffmpeg_branding == "Chrome") || (use_linux_config && current_cpu == "arm64" && ffmpeg_branding == "ChromeOS")) {
+if ((is_android && current_cpu == "arm64" && ffmpeg_branding == "Chrome") || (use_linux_config && current_cpu == "arm64")) {
   ffmpeg_c_sources += [
     "libavcodec/aarch64/aacpsdsp_init_aarch64.c",
     "libavcodec/aarch64/mpegaudiodsp_init.c",