Replace ASSERT by RTC_DCHECK in all non-test code.

webrtc/base/sslidentity.cc

Index: webrtc/base/sslidentity.cc
diff --git a/webrtc/base/sslidentity.cc b/webrtc/base/sslidentity.cc
index 090428dd350ede20b9dc1307bedc52d9fbae1ef4..645050a7e4b9deccc0b045d4539c6a2cc5f35b93 100644
--- a/webrtc/base/sslidentity.cc
+++ b/webrtc/base/sslidentity.cc
@@ -200,7 +200,7 @@ std::string SSLIdentity::DerToPem(const std::string& pem_type,
 }
 
 SSLCertChain::SSLCertChain(const std::vector<SSLCertificate*>& certs) {
-  ASSERT(!certs.empty());
+  RTC_DCHECK(!certs.empty());
   certs_.resize(certs.size());
   std::transform(certs.begin(), certs.end(), certs_.begin(), DupCert);
 }