Refactor webrtc/{api,audio} and modules/audio_coding for GN check

webrtc/test/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../build/webrtc.gni")
 import("//build/config/ui.gni")
@@ skipping 76 matching lines @@
     "../system_wrappers:field_trial_default",
   ]
 }
 
 rtc_source_set("test_main") {
   testonly = true
   sources = [
     "test_main.cc",
   ]
 
+  public_deps = [
+    ":test_support",
+  ]
   deps = [
     ":field_trial",
-    ":test_support",
     "../system_wrappers:metrics_default",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/gflags",
   ]
 }
 
 rtc_source_set("fileutils") {
   testonly = true
   sources = [
@@ skipping 287 matching lines @@
     suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
   }
 
   deps = [
     ":test_support",
     ":video_test_common",
     "../modules/media_file",
     "//testing/gtest",
   ]
 }