Replace ASSERT by RTC_DCHECK in all non-test code.

webrtc/base/asyncsocket.cc

Index: webrtc/base/asyncsocket.cc
diff --git a/webrtc/base/asyncsocket.cc b/webrtc/base/asyncsocket.cc
index 089802e018162197df7e5779859e657393e2cb5c..873badc81812b493f79449d9500d50493fd89aa9 100644
--- a/webrtc/base/asyncsocket.cc
+++ b/webrtc/base/asyncsocket.cc
@@ -9,6 +9,7 @@
  */
 
 #include "webrtc/base/asyncsocket.h"
+#include "webrtc/base/checks.h"
 
 namespace rtc {
 
@@ -27,7 +28,7 @@ AsyncSocketAdapter::~AsyncSocketAdapter() {
 }
 
 void AsyncSocketAdapter::Attach(AsyncSocket* socket) {
-  ASSERT(!socket_);
+  RTC_DCHECK(!socket_);
   socket_ = socket;
   if (socket_) {
     socket_->SignalConnectEvent.connect(this,