Revert of - Clean up unused voice engine DTMF code.

webrtc/media/engine/webrtcvoiceengine.cc

Index: webrtc/media/engine/webrtcvoiceengine.cc
diff --git a/webrtc/media/engine/webrtcvoiceengine.cc b/webrtc/media/engine/webrtcvoiceengine.cc
index a496316b42149637757846ec3e20f89b32915f02..f57db27a3177f494813af1465657fcc6a7dfd074 100644
--- a/webrtc/media/engine/webrtcvoiceengine.cc
+++ b/webrtc/media/engine/webrtcvoiceengine.cc
@@ -1178,7 +1178,8 @@
     RTC_CHECK(stream_);
   }
 
-  bool SendTelephoneEvent(int payload_type, int event, int duration_ms) {
+  bool SendTelephoneEvent(int payload_type, uint8_t event,
+                          uint32_t duration_ms) {
     RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
     RTC_DCHECK(stream_);
     return stream_->SendTelephoneEvent(payload_type, event, duration_ms);