Removes unused APIs from the ADM (part II).

Removes:

int32_t SpeakerVolumeStepSize(uint16_t* stepSize)
int32_t MicrophoneVolumeStepSize(uint16_t* stepSize)
int32_t MicrophoneBoostIsAvailable(bool* available)
int32_t SetMicrophoneBoost(bool enable)
int32_t MicrophoneBoost(bool* enabled)
int32_t SetPlayoutBuffer(const BufferType type, uint16_t sizeMS = 0)
int32_t PlayoutBuffer(BufferType* type, uint16_t* sizeMS)
int32_t CPULoad(uint16_t* load)
int32_t StartRawOutputFileRecording(const char pcmFileNameUTF8[kAdmMaxFileNameSize])
int32_t StopRawOutputFileRecording()
int32_t StartRawInputFileRecording(const char pcmFileNameUTF8[kAdmMaxFileNameSize])
int32_t StopRawInputFileRecording()
int32_t ResetAudioDevice()

BUG=webrtc:7306

Review-Url: https://codereview.webrtc.org/3006803002
Cr-Original-Commit-Position: refs/heads/master@{#19632}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 9868042b053d52c45c632f09c1d22cb13bc1ad41
33 files changed