Move Window's specific logic for disabling ECDSA from QuicCryptoyclientConfig

net/quic/quic_stream_factory.cc

Index: net/quic/quic_stream_factory.cc
diff --git a/net/quic/quic_stream_factory.cc b/net/quic/quic_stream_factory.cc
index e98f0acdf1103c069d016aeb8e105faa854b8d1c..178338e78b94461df38bea117d6cf6ff51e54a7b 100644
--- a/net/quic/quic_stream_factory.cc
+++ b/net/quic/quic_stream_factory.cc
@@ -34,6 +34,10 @@
 #include "net/quic/quic_session_key.h"
 #include "net/socket/client_socket_factory.h"
 
+#if defined(OS_WIN)
+#include "base/win/windows_version.h"
+#endif
+
 using std::string;
 using std::vector;
 
@@ -43,6 +47,15 @@ namespace {
 
 const uint64 kBrokenAlternateProtocolDelaySecs = 300;
 
+bool IsEcdsaSupported() {
+#if defined(OS_WIN)
+  if (base::win::GetVersion() < base::win::VERSION_VISTA)
+    return false;
+#endif
+
+  return true;
+}
+
 }  // namespace
 
 QuicStreamFactory::IpAliasKey::IpAliasKey() {}
@@ -383,6 +396,8 @@ QuicStreamFactory::QuicStreamFactory(
   crypto_config_.AddCanonicalSuffix(".c.youtube.com");
   crypto_config_.AddCanonicalSuffix(".googlevideo.com");
   crypto_config_.SetProofVerifier(new ProofVerifierChromium(cert_verifier));
+  if (!IsEcdsaSupported())
+    crypto_config_.DisableEcdsa();
 }
 
 QuicStreamFactory::~QuicStreamFactory() {