Allow TransportController to create a QuicTransportChannel

webrtc/base/sslfingerprint.cc

Index: webrtc/base/sslfingerprint.cc
diff --git a/webrtc/base/sslfingerprint.cc b/webrtc/base/sslfingerprint.cc
index 1939b4fd0bd8c9cacb33ffef76b89b35bfe736b3..2c3e1e974be4517bc34cd8ba6f763ddf679da9c2 100644
--- a/webrtc/base/sslfingerprint.cc
+++ b/webrtc/base/sslfingerprint.cc
@@ -85,7 +85,7 @@ std::string SSLFingerprint::GetRfc4572Fingerprint() const {
   return fingerprint;
 }
 
-std::string SSLFingerprint::ToString() {
+std::string SSLFingerprint::ToString() const {
   std::string fp_str = algorithm;
   fp_str.append(" ");
   fp_str.append(GetRfc4572Fingerprint());