Update from chromium https://crrev.com/301725/

net/quic/test_tools/crypto_test_utils_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/test_tools/crypto_test_utils.h"
 
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "crypto/ec_private_key.h"
 #include "crypto/ec_signature_creator.h"
 #include "net/quic/crypto/channel_id.h"
 #include "net/quic/crypto/channel_id_chromium.h"
 
 using base::StringPiece;
 using std::string;
 
 namespace net {
 
 namespace test {
 
 class TestChannelIDSource : public ChannelIDSource {
  public:
-  virtual ~TestChannelIDSource() {
-    STLDeleteValues(&hostname_to_key_);
-  }
+  ~TestChannelIDSource() override { STLDeleteValues(&hostname_to_key_); }
 
   // ChannelIDSource implementation.
 
-  virtual QuicAsyncStatus GetChannelIDKey(
+  QuicAsyncStatus GetChannelIDKey(
       const string& hostname,
       scoped_ptr<ChannelIDKey>* channel_id_key,
       ChannelIDSourceCallback* /*callback*/) override {
     channel_id_key->reset(new ChannelIDKeyChromium(HostnameToKey(hostname)));
     return QUIC_SUCCESS;
   }
 
  private:
   typedef std::map<string, crypto::ECPrivateKey*> HostnameToKeyMap;
 
@@ skipping 15 matching lines @@
 };
 
 // static
 ChannelIDSource* CryptoTestUtils::ChannelIDSourceForTesting() {
   return new TestChannelIDSource();
 }
 
 }  // namespace test
 
 }  // namespace net