Refactoring output of ProofSource::GetProof (no functional changes).

net/quic/chromium/crypto/proof_source_chromium.h

Index: net/quic/chromium/crypto/proof_source_chromium.h
diff --git a/net/quic/chromium/crypto/proof_source_chromium.h b/net/quic/chromium/crypto/proof_source_chromium.h
index 2cbf44b6250a7eb6a7f4c98606dd299c105cae9f..5351fe007c31e73d9aa4a7985e9f4c4626b94dd3 100644
--- a/net/quic/chromium/crypto/proof_source_chromium.h
+++ b/net/quic/chromium/crypto/proof_source_chromium.h
@@ -40,8 +40,7 @@ class NET_EXPORT_PRIVATE ProofSourceChromium : public ProofSource {
                 base::StringPiece chlo_hash,
                 const QuicTagVector& connection_options,
                 scoped_refptr<ProofSource::Chain>* out_chain,
-                std::string* out_signature,
-                std::string* out_leaf_cert_sct) override;
+                QuicCryptoProof* proof) override;
 
   void GetProof(const IPAddress& server_ip,
                 const std::string& hostname,