Make RtpSenderAudio not inherit from DtmfQueue

webrtc/modules/rtp_rtcp/source/dtmf_queue.cc

Index: webrtc/modules/rtp_rtcp/source/dtmf_queue.cc
diff --git a/webrtc/modules/rtp_rtcp/source/dtmf_queue.cc b/webrtc/modules/rtp_rtcp/source/dtmf_queue.cc
index 81e8b5926e2f6af288fa8bc6df548fd915424544..8dbfaa2f3c1b6889be85b7f2d954c320f4bcab18 100644
--- a/webrtc/modules/rtp_rtcp/source/dtmf_queue.cc
+++ b/webrtc/modules/rtp_rtcp/source/dtmf_queue.cc
@@ -19,8 +19,6 @@ DTMFqueue::DTMFqueue() : next_empty_index_(0) {
   memset(dtmf_level_, 0, sizeof(dtmf_level_));
 }
 
-DTMFqueue::~DTMFqueue() {}
-
 int32_t DTMFqueue::AddDTMF(uint8_t key, uint16_t len, uint8_t level) {
   rtc::CritScope lock(&dtmf_critsect_);
 
@@ -59,9 +57,4 @@ bool DTMFqueue::PendingDTMF() {
   rtc::CritScope lock(&dtmf_critsect_);
   return next_empty_index_ > 0;
 }
-
-void DTMFqueue::ResetDTMF() {
-  rtc::CritScope lock(&dtmf_critsect_);
-  next_empty_index_ = 0;
-}
 }  // namespace webrtc