Remove Windows Vista/XP specific code from net/quic.

net/quic/crypto/proof_test.cc

Index: net/quic/crypto/proof_test.cc
diff --git a/net/quic/crypto/proof_test.cc b/net/quic/crypto/proof_test.cc
index 5e3cd9b1be53f0081f0ac4f8b77d31ffa42f3909..33fa4a51b7418becc9269f485105586b9b7bb39b 100644
--- a/net/quic/crypto/proof_test.cc
+++ b/net/quic/crypto/proof_test.cc
@@ -18,10 +18,6 @@
 #include "net/test/cert_test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-#if defined(OS_WIN)
-#include "base/win/windows_version.h"
-#endif
-
 using std::string;
 using std::vector;
 
@@ -334,15 +330,6 @@ TEST_P(ProofTest, VerifyECDSAKnownAnswerTest) {
   if (GetParam() > QUIC_VERSION_30) {
     return;
   }
-// These sample signatures were generated by running the Proof.Verify test
-// (modified to use ECDSA for signing proofs) and dumping the bytes of the
-// |signature| output of ProofSource::GetProof().
-
-// Disable this test on platforms that do not support ECDSA certificates.
-#if defined(OS_WIN)
-  if (base::win::GetVersion() < base::win::VERSION_VISTA)
-    return;
-#endif
 
   // These sample signatures were generated by running the Proof.Verify test
   // (modified to use ECDSA for signing proofs) and dumping the bytes of the