Fix warnings, simplify ADM.

webrtc/api/test/fakeaudiocapturemodule.h

Index: webrtc/api/test/fakeaudiocapturemodule.h
diff --git a/webrtc/api/test/fakeaudiocapturemodule.h b/webrtc/api/test/fakeaudiocapturemodule.h
index f89249ad2f988eff5cf1155ee118693c6cbc6e4b..34aa7e09dbcd25805a82dbff07d9841d7dd1d8c1 100644
--- a/webrtc/api/test/fakeaudiocapturemodule.h
+++ b/webrtc/api/test/fakeaudiocapturemodule.h
@@ -179,6 +179,16 @@ class FakeAudioCaptureModule
   int32_t EnableBuiltInAGC(bool enable) override { return -1; }
   bool BuiltInNSIsAvailable() const override { return false; }
   int32_t EnableBuiltInNS(bool enable) override { return -1; }
+#if defined(WEBRTC_IOS)
+  int GetPlayoutAudioParameters(
+      webrtc::AudioParameters* params) const override {
+    return -1;
+  }
+  int GetRecordAudioParameters(webrtc::AudioParameters* params) const override {
+    return -1;
+  }
+#endif  // WEBRTC_IOS
+
   // End of functions inherited from webrtc::AudioDeviceModule.
 
   // The following function is inherited from rtc::MessageHandler.