Add opus dep to media pipeline_integration_test.

media/BUILD.gn

Index: media/BUILD.gn
diff --git a/media/BUILD.gn b/media/BUILD.gn
index 2d62c02ba673b121071d541e8281c47b0e852ead..caf1ed8f8ecdd39b4efad39e56717befdd48d0dc 100644
--- a/media/BUILD.gn
+++ b/media/BUILD.gn
@@ -648,7 +648,6 @@ source_set("unit_tests") {
   }
 
   if (media_use_ffmpeg) {
-    deps += [ "//media/ffmpeg:ffmpeg_unittests" ]
     sources += [
       "filters/audio_decoder_unittest.cc",
       "filters/audio_file_reader_unittest.cc",
@@ -658,6 +657,13 @@ source_set("unit_tests") {
       "filters/in_memory_url_protocol_unittest.cc",
     ]
 
+    deps += [
+      "//media/ffmpeg:ffmpeg_unittests",
+
+      # Direct dependency needed for the config
+      "//third_party/opus",
+    ]
+
     if (!is_android) {
       sources += [
         # FFmpeg on Android does not include video decoders.