Move Window's specific logic for disabling ECDSA from QuicCryptoyclientConfig

net/quic/crypto/quic_crypto_client_config.h

Index: net/quic/crypto/quic_crypto_client_config.h
diff --git a/net/quic/crypto/quic_crypto_client_config.h b/net/quic/crypto/quic_crypto_client_config.h
index f21d051479f1232c4c5e102413114c3b43ca2569..d6ce2e4c4ad45dff92083d38f01d8c627d905284 100644
--- a/net/quic/crypto/quic_crypto_client_config.h
+++ b/net/quic/crypto/quic_crypto_client_config.h
@@ -229,6 +229,11 @@ class NET_EXPORT_PRIVATE QuicCryptoClientConfig : public QuicCryptoConfig {
   // called after SetDefaults().
   void PreferAesGcm();
 
+  // Disables the use of ECDSA for proof verification.
+  // Call this method on platforms that do not support ECDSA.
+  // TODO(rch): remove this method when we drop support for Windows XP.
+  void DisableEcdsa();
+
  private:
   typedef std::map<QuicSessionKey, CachedState*> CachedStateMap;
 
@@ -255,6 +260,9 @@ class NET_EXPORT_PRIVATE QuicCryptoClientConfig : public QuicCryptoConfig {
   scoped_ptr<ProofVerifier> proof_verifier_;
   scoped_ptr<ChannelIDSigner> channel_id_signer_;
 
+  // True if ECDSA should be disabled.
+  bool disable_ecdsa_;
+
   DISALLOW_COPY_AND_ASSIGN(QuicCryptoClientConfig);
 };