Add a Clone method to ProofVerifyDetails to allow for the proof verify

net/quic/crypto/proof_verifier_chromium.h

Index: net/quic/crypto/proof_verifier_chromium.h
diff --git a/net/quic/crypto/proof_verifier_chromium.h b/net/quic/crypto/proof_verifier_chromium.h
index c67ce8c6c943fcc069760edc9fb086a4de2365d2..5e6ba99447cab8c3a8df611a97bd801d0d4df7e4 100644
--- a/net/quic/crypto/proof_verifier_chromium.h
+++ b/net/quic/crypto/proof_verifier_chromium.h
@@ -24,8 +24,13 @@ class CertVerifier;
 
 // ProofVerifyDetailsChromium is the implementation-specific information that a
 // ProofVerifierChromium returns about a certificate verification.
-struct ProofVerifyDetailsChromium : public ProofVerifyDetails {
+class NET_EXPORT_PRIVATE ProofVerifyDetailsChromium
+    : public ProofVerifyDetails {
  public:
+
+  // ProofVerifyDetails implementation
+  virtual ProofVerifyDetails* Clone() const OVERRIDE;
+
   CertVerifyResult cert_verify_result;
 };