Convert //sandbox to use std::unique_ptr

sandbox/linux/services/thread_helpers_unittests.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 "sandbox/linux/services/thread_helpers.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include "base/logging.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/process/process_metrics.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread.h"
 #include "build/build_config.h"
 #include "sandbox/linux/tests/unit_tests.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::PlatformThread;
 
@@ skipping 118 matching lines @@
   SANDBOX_ASSERT(thread1.Start());
   ThreadHelpers::AssertSingleThreaded();
 }
 #endif  // !defined(NDEBUG)
 
 #endif  // !defined(THREAD_SANITIZER)
 
 }  // namespace
 
 }  // namespace sandbox