Convert //tools to use std::unique_ptr

tools/gn/string_utils_unittest.cc

 // Copyright (c) 2013 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 "tools/gn/string_utils.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/err.h"
 #include "tools/gn/scope.h"
 #include "tools/gn/settings.h"
 #include "tools/gn/token.h"
 #include "tools/gn/value.h"
 
 namespace {
 
 bool CheckExpansionCase(const char* input, const char* expected, bool success) {
   Scope scope(static_cast<const Settings*>(nullptr));
   int64_t one = 1;
   scope.SetValue("one", Value(nullptr, one), nullptr);
   scope.SetValue("onestring", Value(nullptr, "one"), nullptr);
 
   // Nested scope called "onescope" with a value "one" inside it.
-  scoped_ptr<Scope> onescope(new Scope(static_cast<const Settings*>(nullptr)));
+  std::unique_ptr<Scope> onescope(
+      new Scope(static_cast<const Settings*>(nullptr)));
   onescope->SetValue("one", Value(nullptr, one), nullptr);
   scope.SetValue("onescope", Value(nullptr, std::move(onescope)), nullptr);
 
   // List called "onelist" with one value that maps to 1.
   Value onelist(nullptr, Value::LIST);
   onelist.list_value().push_back(Value(nullptr, one));
   scope.SetValue("onelist", onelist, nullptr);
 
   // Construct the string token, which includes the quotes.
   std::string literal_string;
@@ skipping 108 matching lines @@
   words.push_back("won\'t");
   words.push_back("help");
   words.push_back("you");
   words.push_back("now");
 
   EXPECT_EQ("help", SpellcheckString("halp", words));
 
   // barbados has an edit distance of 4 from bravado, so there's no suggestion.
   EXPECT_TRUE(SpellcheckString("barbados", words).empty());
 }