Removing NSS files and USE_OPENSSL flag

net/quic/crypto/proof_source_chromium_nss.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "net/quic/crypto/proof_source_chromium.h"
-
-using std::string;
-using std::vector;
-
-namespace net {
-
-ProofSourceChromium::ProofSourceChromium() {}
-
-ProofSourceChromium::~ProofSourceChromium() {}
-
-bool ProofSourceChromium::Initialize(const base::FilePath& cert_path,
-                                     const base::FilePath& key_path,
-                                     const base::FilePath& sct_path) {
-  return false;
-}
-
-bool ProofSourceChromium::GetProof(const IPAddress& server_ip,
-                                   const string& hostname,
-                                   const string& server_config,
-                                   QuicVersion quic_version,
-                                   base::StringPiece chlo_hash,
-                                   bool ecdsa_ok,
-                                   scoped_refptr<ProofSource::Chain>* out_chain,
-                                   string* out_signature,
-                                   string* out_leaf_cert_sct) {
-  return false;
-}
-
-}  // namespace net