ParseCandidate(): Refactor to fix memcheck false positive.

webrtc/api/webrtcsdp.cc

Index: webrtc/api/webrtcsdp.cc
diff --git a/webrtc/api/webrtcsdp.cc b/webrtc/api/webrtcsdp.cc
index b700d8550e78c4aed316f6f4aab9bee10025d51a..f0e94b62210e2962c039274ee49942b28db75b41 100644
--- a/webrtc/api/webrtcsdp.cc
+++ b/webrtc/api/webrtcsdp.cc
@@ -1034,10 +1034,18 @@ bool ParseCandidate(const std::string& message, Candidate* candidate,
   SocketAddress address(connection_address, port);
 
   cricket::ProtocolType protocol;
-  if (!StringToProto(transport.c_str(), &protocol) ||
-      protocol == cricket::PROTO_TLS) {
+  if (!StringToProto(transport.c_str(), &protocol)) {
     return ParseFailed(first_line, "Unsupported transport type.", error);
   }
+  switch (protocol) {
+    case cricket::PROTO_UDP:
+    case cricket::PROTO_TCP:
+    case cricket::PROTO_SSLTCP:
+      // Supported protocol.
+      break;
+    default:
+      return ParseFailed(first_line, "Unsupported transport type.", error);
+  }
 
   std::string candidate_type;
   const std::string& type = fields[7];