Loosening the coupling between WebRTC and //third_party/protobuf

webrtc/modules/audio_coding/BUILD.gn

Index: webrtc/modules/audio_coding/BUILD.gn
diff --git a/webrtc/modules/audio_coding/BUILD.gn b/webrtc/modules/audio_coding/BUILD.gn
index 3a2d20a800e8326fe4b6077992474c7213ffd31d..5a4473e2407d1a7fe07174635f183cf5b27241bd 100644
--- a/webrtc/modules/audio_coding/BUILD.gn
+++ b/webrtc/modules/audio_coding/BUILD.gn
@@ -848,7 +848,11 @@ rtc_static_library("webrtc_opus") {
     public_deps += [ rtc_opus_dir ]
   } else if (build_with_mozilla) {
     include_dirs = [ getenv("DIST") + "/include/opus" ]
+
+    # TODO(mbonadei): this is an hack. Remove and fix the dependency error
+    include_dirs += [ "//third_party/protobuf/src" ]

[kjellander_webrtc, 2017/03/14 21:28:05]

We should avoid adding include_dirs whenever we can and inherit them by adding
the right dependencies instead. See previous comment.

[mbonadei, 2017/03/15 10:08:05]

Done.

   }
+  include_dirs = [ "//third_party/protobuf/src" ]
 }
 
 rtc_source_set("webrtc_opus_c") {
@@ -918,6 +922,7 @@ rtc_static_library("audio_network_adaptor") {
 
   deps = [
     "../..:webrtc_common",
+    "../../base:protobuf_utils",
     "../../base:rtc_base_approved",
     "../../common_audio",
     "../../logging:rtc_event_log_api",
@@ -2078,6 +2083,7 @@ if (rtc_include_tests) {
       "../..:webrtc_common",
       "../../api/audio_codecs:audio_codecs_api",
       "../../api/audio_codecs:builtin_audio_decoder_factory",
+      "../../base:protobuf_utils",
       "../../base:rtc_base",
       "../../base:rtc_base_approved",
       "../../base:rtc_base_tests_utils",