Revert of Enabling `gn check` on webrtc/test

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 6476831d728cabd890b8d06ed5fd49d5f0f46443..2f678d6dc082529657946346d84dac3e36960508 100644
--- a/webrtc/modules/audio_device/BUILD.gn
+++ b/webrtc/modules/audio_device/BUILD.gn
@@ -254,19 +254,6 @@
   }
 }
 
-rtc_source_set("mock_audio_device") {
-  testonly = true
-  sources = [
-    "include/mock_audio_device.h",
-    "include/mock_audio_transport.h",
-  ]
-  deps = [
-    ":audio_device",
-    "../../test:test_support",
-  ]
-  all_dependent_configs = [ ":mock_audio_device_config" ]
-}
-
 if (rtc_include_tests) {
   rtc_source_set("audio_device_unittests") {
     testonly = true
@@ -322,6 +309,19 @@
     }
   }
 
+  rtc_source_set("mock_audio_device") {
+    testonly = true
+    sources = [
+      "include/mock_audio_device.h",
+      "include/mock_audio_transport.h",
+    ]
+    deps = [
+      ":audio_device",
+      "../../test:test_support",
+    ]
+    all_dependent_configs = [ ":mock_audio_device_config" ]
+  }
+
   if (!is_ios) {
     # These tests do not work on ios, see
     # https://bugs.chromium.org/p/webrtc/issues/detail?id=4755