Convert FieldTrialList to Accept a std::unique_ptr

chrome/browser/io_thread_unittest.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 <stddef.h>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/macros.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/run_loop.h"
 #include "base/test/mock_entropy_provider.h"
 #include "build/build_config.h"
 #include "chrome/browser/io_thread.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "components/policy/core/common/mock_policy_service.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
@@ skipping 266 matching lines @@
   ConfigureParamsFromFieldTrialsAndCommandLine();
 
   EXPECT_FALSE(params_.enable_http2);
 }
 
 // Command line flag should not only disable QUIC but should also prevent QUIC
 // related field trials and command line flags from being parsed.
 TEST_F(ConfigureParamsFromFieldTrialsAndCommandLineTest,
        DisableQuicFromCommandLineOverridesFieldTrial) {
   auto field_trial_list =
-      base::MakeUnique<base::FieldTrialList>(new base::MockEntropyProvider());
+      base::MakeUnique<base::FieldTrialList>(
+          base::MakeUnique<base::MockEntropyProvider>());
   variations::testing::ClearAllVariationParams();
 
   std::map<std::string, std::string> field_trial_params;
   field_trial_params["always_require_handshake_confirmation"] = "true";
   field_trial_params["disable_delay_tcp_race"] = "true";
   variations::AssociateVariationParams("QUIC", "Enabled", field_trial_params);
   base::FieldTrialList::CreateFieldTrial("QUIC", "Enabled");
 
   command_line_.AppendSwitch("disable-quic");
   command_line_.AppendSwitchASCII("quic-host-whitelist",
@@ skipping 150 matching lines @@
   command_line_.AppendSwitchASCII("testing-fixed-http-port", "42");
   command_line_.AppendSwitchASCII("testing-fixed-https-port", "137");
 
   ConfigureParamsFromFieldTrialsAndCommandLine();
 
   EXPECT_EQ(42u, params_.testing_fixed_http_port);
   EXPECT_EQ(137u, params_.testing_fixed_https_port);
 }
 
 }  // namespace test