Convert //components/prefs from scoped_ptr to std::unique_ptr

components/metrics/stability_metrics_helper_unittest.cc

 // Copyright 2015 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 "components/metrics/stability_metrics_helper.h"
 
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "components/metrics/proto/system_profile.pb.h"
 #include "components/prefs/pref_service.h"
 #include "components/prefs/scoped_user_pref_update.h"
 #include "components/prefs/testing_pref_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace metrics {
 
 namespace {
 
@@ skipping 69 matching lines @@
   system_profile.Clear();
   helper.ProvideStabilityMetrics(&system_profile);
 
   EXPECT_EQ(0, system_profile.stability().renderer_crash_count());
   EXPECT_EQ(1, system_profile.stability().extension_renderer_crash_count());
   EXPECT_EQ(
       1, system_profile.stability().extension_renderer_failed_launch_count());
 }
 
 }  // namespace metrics