Add opus dep to media pipeline_integration_test.

arm devices require the OPUS_FIXED_POINT. This define got lost at some
point. Add a public_dep so the media_unittests gets the necessary
config.

BUG=672352
TEST=gn desc out/ //media:media_unittests

Review-Url: https://codereview.chromium.org/2562513003
Cr-Commit-Position: refs/heads/master@{#437628}

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.

media/test/BUILD.gn

@@ -68,6 +68,9 @@ source_set("pipeline_integration_tests") {
       "//media/base:test_support",
       "//media/mojo/clients",
       "//services/service_manager/public/cpp:service_test_support",
+
+      # Needed for the opus_config
+      "//third_party/opus",
       "//url",
 
       # TODO(dalecurtis): Required since the gmock header is included in the