GYP->GN of audio_device_tests. Remove dead code. Fix new warnings.

webrtc/modules/audio_device/BUILD.gn

Index: webrtc/modules/audio_device/BUILD.gn
diff --git a/webrtc/modules/audio_device/BUILD.gn b/webrtc/modules/audio_device/BUILD.gn
index 35a99eaac7e6cae274ddb9607b6d17cc175eaa7e..34c15a1ad50414f87a0b8c32edc0f9dbafd30c32 100644
--- a/webrtc/modules/audio_device/BUILD.gn
+++ b/webrtc/modules/audio_device/BUILD.gn
@@ -29,17 +29,20 @@ source_set("audio_device") {
     "../..:webrtc_common",
     "../../base:rtc_base",
     "../../base:rtc_base_approved",
+    "../../base:rtc_task_queue",
     "../../common_audio",
     "../../system_wrappers",
     "../utility",
   ]
 
   sources = [
+    "audio_device.cc",
     "audio_device_buffer.cc",
     "audio_device_buffer.h",
     "audio_device_config.h",
     "audio_device_generic.cc",
     "audio_device_generic.h",
+    "audio_transport.cc",
     "dummy/audio_device_dummy.cc",
     "dummy/audio_device_dummy.h",
     "dummy/file_audio_device.cc",
@@ -210,3 +213,30 @@ source_set("audio_device") {
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 }
+
+# These tests do not work on ios, see
+# https://bugs.chromium.org/p/webrtc/issues/detail?id=4755
+if (!is_ios) {

[kjellander_webrtc, 2016/08/05 12:47:58]

Make this:
if (rtc_include_tests && !is_ios) {
to prevent Chromium from including the test in its 'all' target.

[Max Morin WebRTC, 2016/08/05 20:58:48]

Done.

+  executable("audio_device_tests") {
+    testonly = true
+    sources = [
+      "test/audio_device_test_api.cc",
+      "test/audio_device_test_defines.h",
+    ]
+    deps = [
+      ":audio_device",
+      "../..:webrtc_common",
+      "../../../testing/gtest:gtest",

[kjellander_webrtc, 2016/08/05 12:47:58]

Make this 
//testing/gtest:gtest
or just 
//testing/gtest 
(which is more common).

The rest needs to be relative, as they're inside the WebRTC repo (needs to be
like that to avoid errors when parsed by a Chromium build)

[Max Morin WebRTC, 2016/08/05 20:58:48]

Done.

+      "../../system_wrappers",
+      "../../test:test_support",

[kjellander_webrtc, 2016/08/05 12:47:58]

you don't need this if you depend on test_support_main.

[Max Morin WebRTC, 2016/08/05 20:58:48]

"gn check" warns without it, since audio_device_test_api.cc includes
webrtc/test/testsupport/fileutils.h, which isn't directly in test_support_main

+      "../../test:test_support_main",
+      "../rtp_rtcp",
+      "../utility",
+    ]
+    configs += [ "../..:common_config" ]
+    public_configs = [
+      "../..:common_inherited_config",
+      ":audio_device_config",
+    ]
+  }
+}