Loosening the coupling between WebRTC and //third_party/protobuf

webrtc/modules/audio_processing/BUILD.gn

Index: webrtc/modules/audio_processing/BUILD.gn
diff --git a/webrtc/modules/audio_processing/BUILD.gn b/webrtc/modules/audio_processing/BUILD.gn
index 36f55756f825fe0b719d6a6c0d0ca1563ade5c65..84545dd8b089c161977026052db5f4573862bdbd 100644
--- a/webrtc/modules/audio_processing/BUILD.gn
+++ b/webrtc/modules/audio_processing/BUILD.gn
@@ -232,6 +232,7 @@ rtc_static_library("audio_processing") {
     "../..:webrtc_common",
     "../../audio/utility:audio_frame_operations",
     "../../base:gtest_prod",
+    "../../base:protobuf_utils",
     "../audio_coding:isac",
   ]
   public_deps = [
@@ -524,6 +525,7 @@ if (rtc_include_tests) {
       ":audioproc_test_utils",
       "../..:webrtc_common",
       "../../base:gtest_prod",
+      "../../base:protobuf_utils",
       "../../base:rtc_base",
       "../../base:rtc_base_approved",
       "../../common_audio:common_audio",
@@ -656,8 +658,10 @@ if (rtc_include_tests) {
     deps = [
       ":audio_processing",
       ":audioproc_test_utils",
+      "../../base:protobuf_utils",
       "//testing/gtest",
     ]
+
     if (rtc_enable_intelligibility_enhancer) {
       defines = [ "WEBRTC_INTELLIGIBILITY_ENHANCER=1" ]
     } else {
@@ -678,6 +682,7 @@ if (rtc_include_tests) {
         ":audioproc_protobuf_utils",
         ":audioproc_test_utils",
         "../..:webrtc_common",
+        "../../base:protobuf_utils",
         "../../base:rtc_base_approved",
         "../../common_audio",
         "../../system_wrappers:system_wrappers_default",
@@ -702,6 +707,7 @@ if (rtc_include_tests) {
         ":audioproc_debug_proto",
         ":audioproc_protobuf_utils",
         ":audioproc_test_utils",
+        "../../base:protobuf_utils",
         "../../base:rtc_base_approved",
         "../../common_audio:common_audio",
         "../../system_wrappers",
@@ -817,6 +823,7 @@ if (rtc_include_tests) {
       deps = [
         ":audioproc_debug_proto",
         "../..:webrtc_common",
+        "../../base:protobuf_utils",
         "../../base:rtc_base_approved",
       ]
     }