Fix QUIC crash when ProofSource::GetProof fails

net/quic/test_tools/quic_crypto_server_config_peer.h

 // Copyright 2016 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.
 
 #ifndef NET_QUIC_TEST_TOOLS_QUIC_CRYPTO_SERVER_CONFIG_PEER_H_
 #define NET_QUIC_TEST_TOOLS_QUIC_CRYPTO_SERVER_CONFIG_PEER_H_
 
 #include "net/quic/core/crypto/quic_crypto_server_config.h"
 
 namespace net {
 namespace test {
 
 // Peer for accessing otherwise private members of a QuicCryptoServerConfig.
 class QuicCryptoServerConfigPeer {
  public:
-  explicit QuicCryptoServerConfigPeer(
-      const QuicCryptoServerConfig* server_config)
+  explicit QuicCryptoServerConfigPeer(QuicCryptoServerConfig* server_config)
       : server_config_(server_config) {}
 
   // Returns the proof source.
   ProofSource* GetProofSource();
 
   // Returns the primary config.
   QuicReferenceCountedPointer<QuicCryptoServerConfig::Config>
   GetPrimaryConfig();
 
   // Returns the config associated with |config_id|.
   QuicReferenceCountedPointer<QuicCryptoServerConfig::Config> GetConfig(
       std::string config_id);
 
   // Returns a pointer to the ProofSource object.
   ProofSource* GetProofSource() const;
 
+  // Reset the proof_source_ member.
+  void ResetProofSource(std::unique_ptr<ProofSource> proof_source);
+
   // Generates a new valid source address token.
   std::string NewSourceAddressToken(
       std::string config_id,
       SourceAddressTokens previous_tokens,
       const QuicIpAddress& ip,
       QuicRandom* rand,
       QuicWallTime now,
       CachedNetworkParameters* cached_network_params);
 
   // Attempts to validate the tokens in |tokens|.
@@ skipping 40 matching lines @@
       const QuicReferenceCountedPointer<ProofSource::Chain>& chain,
       const std::string& client_common_set_hashes,
       const std::string& client_cached_cert_hashes,
       const CommonCertSets* common_sets);
 
   uint32_t source_address_token_future_secs();
 
   uint32_t source_address_token_lifetime_secs();
 
  private:
-  const QuicCryptoServerConfig* server_config_;
+  QuicCryptoServerConfig* server_config_;
 };
 
 }  // namespace test
 }  // namespace net
 
 #endif  // NET_QUIC_TEST_TOOLS_QUIC_CRYPTO_SERVER_CONFIG_PEER_H_