Replace left-over ASSERTs in httpcommon.h and webrtcsession.cc.

webrtc/api/webrtcsession.cc

Index: webrtc/api/webrtcsession.cc
diff --git a/webrtc/api/webrtcsession.cc b/webrtc/api/webrtcsession.cc
index 30a0a7c25ef955e9d2c9cc3f20e4a4ff8ccd0f09..a0c72c853ec6a54a4e92e052ec4e15e1c560b634 100644
--- a/webrtc/api/webrtcsession.cc
+++ b/webrtc/api/webrtcsession.cc
@@ -2374,7 +2374,7 @@ void WebRtcSession::DestroyTransport(const std::string& transport_name,
 }
 
 void WebRtcSession::DestroyRtcpTransport_n(const std::string& transport_name) {
-  ASSERT(network_thread()->IsCurrent());
+  RTC_DCHECK(network_thread()->IsCurrent());
   transport_controller_->DestroyTransportChannel_n(
       transport_name, cricket::ICE_CANDIDATE_COMPONENT_RTCP);
 }