Removes unused APIs in WebRTC's audio device module (ADM).

Goal is to match recent changes in third_party/webrtc/modules/audio_device/include/audio_device.h
where two unused APIs have been removed. This CL ensures that these methods are removed in Chrome
as well so I can then delete the signatures totally in third party (WebRTC).

Similar changes have been done in https://chromium-review.googlesource.com/c/chromium/src/+/657399

TBR=sergeyu

Bug: webrtc:7306
Change-Id: Ie63ca4db09911601b1cc606c9b5bd47b59add612
Reviewed-on: https://chromium-review.googlesource.com/725737
Commit-Queue: Henrik Andreasson <henrika@chromium.org>
Reviewed-by: Henrik Andreasson <henrika@chromium.org>
Reviewed-by: Max Morin <maxmorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510047}

content/renderer/media/webrtc_audio_device_impl.cc

@@ -351,15 +351,6 @@ int32_t WebRtcAudioDeviceImpl::PlayoutDelay(uint16_t* delay_ms) const {
   return 0;
 }
 
-int32_t WebRtcAudioDeviceImpl::RecordingDelay(uint16_t* delay_ms) const {
-  DCHECK(signaling_thread_checker_.CalledOnValidThread());
-
-  // There is no way to report a correct delay value to WebRTC since there
-  // might be multiple ProcessedLocalAudioSource instances.
-  NOTREACHED();
-  return -1;
-}
-
 int32_t WebRtcAudioDeviceImpl::RecordingSampleRate(
     uint32_t* sample_rate) const {
   DCHECK(signaling_thread_checker_.CalledOnValidThread());

content/renderer/media/webrtc_audio_device_impl.h

@@ -300,7 +300,6 @@ class CONTENT_EXPORT WebRtcAudioDeviceImpl : public WebRtcAudioDeviceNotImpl,
   int32_t StereoPlayoutIsAvailable(bool* available) const override;
   int32_t StereoRecordingIsAvailable(bool* available) const override;
   int32_t PlayoutDelay(uint16_t* delay_ms) const override;
-  int32_t RecordingDelay(uint16_t* delay_ms) const override;
   int32_t RecordingSampleRate(uint32_t* sample_rate) const override;
   int32_t PlayoutSampleRate(uint32_t* sample_rate) const override;
 

content/renderer/media/webrtc_audio_device_not_impl.cc

@@ -13,11 +13,6 @@ int32_t WebRtcAudioDeviceNotImpl::ActiveAudioLayer(
   return 0;
 }
 
-webrtc::AudioDeviceModule::ErrorCode
-WebRtcAudioDeviceNotImpl::LastError() const {
-  return AudioDeviceModule::kAdmErrNone;
-}
-
 int16_t WebRtcAudioDeviceNotImpl::PlayoutDevices() {
   return 0;
 }

content/renderer/media/webrtc_audio_device_not_impl.h

@@ -31,7 +31,6 @@ class CONTENT_EXPORT WebRtcAudioDeviceNotImpl
   // implementation in WebRtcAudioDeviceImpl when needed.
 
   int32_t ActiveAudioLayer(AudioLayer* audio_layer) const override;
-  webrtc::AudioDeviceModule::ErrorCode LastError() const override;
   int16_t PlayoutDevices() override;
   int16_t RecordingDevices() override;
   int32_t PlayoutDeviceName(uint16_t index,

remoting/protocol/webrtc_audio_module.cc

@@ -50,10 +50,6 @@ int32_t WebrtcAudioModule::ActiveAudioLayer(AudioLayer* audio_layer) const {
   return -1;
 }
 
-WebrtcAudioModule::ErrorCode WebrtcAudioModule::LastError() const {
-  return kAdmErrNone;
-}
-
 int32_t WebrtcAudioModule::RegisterAudioCallback(
     webrtc::AudioTransport* audio_transport) {
   base::AutoLock lock(lock_);
@@ -330,11 +326,6 @@ int32_t WebrtcAudioModule::PlayoutDelay(uint16_t* delay_ms) const {
   return 0;
 }
 
-int32_t WebrtcAudioModule::RecordingDelay(uint16_t* delay_ms) const {
-  NOTREACHED();
-  return -1;
-}
-
 int32_t WebrtcAudioModule::SetRecordingSampleRate(
     const uint32_t samples_per_sec) {
   NOTREACHED();

remoting/protocol/webrtc_audio_module.h

@@ -33,7 +33,6 @@ class WebrtcAudioModule : public webrtc::AudioDeviceModule {
 
   // webrtc::AudioDeviceModule implementation.
   int32_t ActiveAudioLayer(AudioLayer* audio_layer) const override;
-  ErrorCode LastError() const override;
   int32_t RegisterAudioCallback(
       webrtc::AudioTransport* audio_callback) override;
   int32_t Init() override;
@@ -94,7 +93,6 @@ class WebrtcAudioModule : public webrtc::AudioDeviceModule {
   int32_t SetRecordingChannel(const ChannelType channel) override;
   int32_t RecordingChannel(ChannelType* channel) const override;
   int32_t PlayoutDelay(uint16_t* delay_ms) const override;
-  int32_t RecordingDelay(uint16_t* delay_ms) const override;
   int32_t SetRecordingSampleRate(const uint32_t samples_per_sec) override;
   int32_t RecordingSampleRate(uint32_t* samples_per_sec) const override;
   int32_t SetPlayoutSampleRate(const uint32_t samples_per_sec) override;