Make QuicDispatcher's helper argument be a unique_ptr to make ownership

net/quic/test_tools/mock_quic_dispatcher.cc

 // Copyright 2014 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/mock_quic_dispatcher.h"
 
 #include "net/quic/test_tools/quic_test_utils.h"
 
 namespace net {
 namespace test {
 
 MockQuicDispatcher::MockQuicDispatcher(
     const QuicConfig& config,
     const QuicCryptoServerConfig* crypto_config,
-    QuicConnectionHelperInterface* helper)
-    : QuicDispatcher(config, crypto_config, QuicSupportedVersions(), helper) {}
+    std::unique_ptr<QuicConnectionHelperInterface> helper)
+    : QuicDispatcher(config,
+                     crypto_config,
+                     QuicSupportedVersions(),
+                     std::move(helper)) {}
 
 MockQuicDispatcher::~MockQuicDispatcher() {}
 
 }  // namespace test
 }  // namespace net