Fix handling of invalid certificates in JingleSessionManager.

remoting/protocol/jingle_session_manager.cc

Index: remoting/protocol/jingle_session_manager.cc
diff --git a/remoting/protocol/jingle_session_manager.cc b/remoting/protocol/jingle_session_manager.cc
index 88c196972b12804e62cf2cb475f198f2c801870f..22ec73367aa5e87525ee05078e3d3585e7f8655f 100644
--- a/remoting/protocol/jingle_session_manager.cc
+++ b/remoting/protocol/jingle_session_manager.cc
@@ -444,7 +444,10 @@ bool JingleSessionManager::ParseContent(
       std::string base64_cert = child->BodyText();
       std::string der_cert;
       bool ret = base::Base64Decode(base64_cert, &der_cert);
-      DCHECK(ret) << "Failed to decode certificate";
+      if (!ret) {
+        LOG(ERROR) << "Failed to decode certificate received from the peer.";
+        return false;
+      }
       certificate = net::X509Certificate::CreateFromBytes(der_cert.data(),
                                                           der_cert.length());
     }