Replace ASSERT(false) by RTC_NOTREACHED().

webrtc/api/webrtcsessiondescriptionfactory.cc

Index: webrtc/api/webrtcsessiondescriptionfactory.cc
diff --git a/webrtc/api/webrtcsessiondescriptionfactory.cc b/webrtc/api/webrtcsessiondescriptionfactory.cc
index 0ab458bdfea65af40401d2f8822fe1c1fef2b0d0..3292f88370b4da20d275f6dc20d6c75be282e60a 100644
--- a/webrtc/api/webrtcsessiondescriptionfactory.cc
+++ b/webrtc/api/webrtcsessiondescriptionfactory.cc
@@ -16,6 +16,7 @@
 #include "webrtc/api/jsepsessiondescription.h"
 #include "webrtc/api/mediaconstraintsinterface.h"
 #include "webrtc/api/webrtcsession.h"
+#include "webrtc/base/checks.h"
 #include "webrtc/base/sslidentity.h"
 
 using cricket::MediaSessionOptions;
@@ -331,7 +332,7 @@ void WebRtcSessionDescriptionFactory::OnMessage(rtc::Message* msg) {
       break;
     }
     default:
-      ASSERT(false);
+      RTC_NOTREACHED();
       break;
   }
 }