Fix building FFMPEG into Android

media/BUILD.gn

Index: media/BUILD.gn
diff --git a/media/BUILD.gn b/media/BUILD.gn
index 8d97ec513ba2e43f871c4a10b1db5d90b40fb9c7..5b92a791eb466f26cea37f1216049f259db6b6f8 100644
--- a/media/BUILD.gn
+++ b/media/BUILD.gn
@@ -377,17 +377,19 @@ component("media") {
   }
 
   if (disable_ffmpeg_video_decoders) {
-      sources -= [
-        "filters/decrypting_video_decoder.cc",
-        "filters/decrypting_video_decoder.h",
-      ]
+    sources -= [
+      "filters/decrypting_video_decoder.cc",
+      "filters/decrypting_video_decoder.h",
+    ]
   }
 
   if (is_android) {
-    sources -= [
-      "filters/decrypting_audio_decoder.cc",
-      "filters/decrypting_audio_decoder.h",
-    ]
+    if (disable_ffmpeg_video_decoders) {
+      sources -= [
+        "filters/decrypting_audio_decoder.cc",
+        "filters/decrypting_audio_decoder.h",
+      ]
+    }
     sources += [
       "filters/android/media_codec_audio_decoder.cc",
       "filters/android/media_codec_audio_decoder.h",
@@ -659,9 +661,7 @@ source_set("unit_tests") {
     ]
 
     if (!disable_ffmpeg_video_decoders) {
-      sources += [
-        "filters/ffmpeg_video_decoder_unittest.cc",
-      ]
+      sources += [ "filters/ffmpeg_video_decoder_unittest.cc" ]
     }
   }