Fix QUIC crash when ProofSource::GetProof fails

net/quic/test_tools/quic_crypto_server_config_peer.cc

 // 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.
 
 #include "net/quic/test_tools/quic_crypto_server_config_peer.h"
 
 #include <cstdarg>
 
 #include "net/quic/test_tools/mock_clock.h"
 #include "net/quic/test_tools/mock_random.h"
@@ skipping 24 matching lines @@
         server_config_->primary_config_);
   } else {
     return server_config_->GetConfigWithScid(config_id);
   }
 }
 
 ProofSource* QuicCryptoServerConfigPeer::GetProofSource() const {
   return server_config_->proof_source_.get();
 }
 
+void QuicCryptoServerConfigPeer::ResetProofSource(
+    std::unique_ptr<ProofSource> proof_source) {
+  server_config_->proof_source_ = std::move(proof_source);
+}
+
 string QuicCryptoServerConfigPeer::NewSourceAddressToken(
     string config_id,
     SourceAddressTokens previous_tokens,
     const QuicIpAddress& ip,
     QuicRandom* rand,
     QuicWallTime now,
     CachedNetworkParameters* cached_network_params) {
   return server_config_->NewSourceAddressToken(*GetConfig(config_id),
                                                previous_tokens, ip, rand, now,
                                                cached_network_params);
@@ skipping 132 matching lines @@
 uint32_t QuicCryptoServerConfigPeer::source_address_token_future_secs() {
   return server_config_->source_address_token_future_secs_;
 }
 
 uint32_t QuicCryptoServerConfigPeer::source_address_token_lifetime_secs() {
   return server_config_->source_address_token_lifetime_secs_;
 }
 
 }  // namespace test
 }  // namespace net