Replace ASSERT by RTC_DCHECK in all non-test code.

webrtc/api/dtmfsender.cc

Index: webrtc/api/dtmfsender.cc
diff --git a/webrtc/api/dtmfsender.cc b/webrtc/api/dtmfsender.cc
index 8fda78430a40b242defd6b09cfb0df31281f32d1..c715d3df846f14f0605dd651f3be81be8649faef 100644
--- a/webrtc/api/dtmfsender.cc
+++ b/webrtc/api/dtmfsender.cc
@@ -81,12 +81,12 @@ DtmfSender::DtmfSender(AudioTrackInterface* track,
       provider_(provider),
       duration_(kDtmfDefaultDurationMs),
       inter_tone_gap_(kDtmfDefaultGapMs) {
-  ASSERT(track_ != NULL);
-  ASSERT(signaling_thread_ != NULL);
+  RTC_DCHECK(track_ != NULL);
+  RTC_DCHECK(signaling_thread_ != NULL);
   // TODO(deadbeef): Once we can use shared_ptr and weak_ptr,
   // do that instead of relying on a "destroyed" signal.
   if (provider_) {
-    ASSERT(provider_->GetOnDestroyedSignal() != NULL);
+    RTC_DCHECK(provider_->GetOnDestroyedSignal() != NULL);
     provider_->GetOnDestroyedSignal()->connect(
         this, &DtmfSender::OnProviderDestroyed);
   }
@@ -105,7 +105,7 @@ void DtmfSender::UnregisterObserver() {
 }
 
 bool DtmfSender::CanInsertDtmf() {
-  ASSERT(signaling_thread_->IsCurrent());
+  RTC_DCHECK(signaling_thread_->IsCurrent());
   if (!provider_) {
     return false;
   }
@@ -114,7 +114,7 @@ bool DtmfSender::CanInsertDtmf() {
 
 bool DtmfSender::InsertDtmf(const std::string& tones, int duration,
                             int inter_tone_gap) {
-  ASSERT(signaling_thread_->IsCurrent());
+  RTC_DCHECK(signaling_thread_->IsCurrent());
 
   if (duration > kDtmfMaxDurationMs ||
       duration < kDtmfMinDurationMs ||
@@ -172,7 +172,7 @@ void DtmfSender::OnMessage(rtc::Message* msg) {
 }
 
 void DtmfSender::DoInsertDtmf() {
-  ASSERT(signaling_thread_->IsCurrent());
+  RTC_DCHECK(signaling_thread_->IsCurrent());
 
   // Get the first DTMF tone from the tone buffer. Unrecognized characters will
   // be ignored and skipped.