Convert //tools to use std::unique_ptr

tools/gn/scope_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 "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/input_file.h"
 #include "tools/gn/parse_tree.h"
 #include "tools/gn/scope.h"
 #include "tools/gn/template.h"
 #include "tools/gn/test_with_scope.h"
@@ skipping 199 matching lines @@
 
   // Root scope should be const from the nested caller's perspective.
   Scope nested1(static_cast<const Scope*>(setup.scope()));
   nested1.SetValue("on_one", Value(&assignment, "on_one"), &assignment);
 
   Scope nested2(&nested1);
   nested2.SetValue("on_one", Value(&assignment, "on_two"), &assignment);
   nested2.SetValue("on_two", Value(&assignment, "on_two2"), &assignment);
 
   // Making a closure from the root scope.
-  scoped_ptr<Scope> result = setup.scope()->MakeClosure();
+  std::unique_ptr<Scope> result = setup.scope()->MakeClosure();
   EXPECT_FALSE(result->containing());  // Should have no containing scope.
   EXPECT_TRUE(result->GetValue("on_root"));  // Value should be copied.
 
   // Making a closure from the second nested scope.
   result = nested2.MakeClosure();
   EXPECT_EQ(setup.scope(),
             result->containing());  // Containing scope should be the root.
   EXPECT_TRUE(HasStringValueEqualTo(result.get(), "on_root", "on_root"));
   EXPECT_TRUE(HasStringValueEqualTo(result.get(), "on_one", "on_two"));
   EXPECT_TRUE(HasStringValueEqualTo(result.get(), "on_two", "on_two2"));
@@ skipping 55 matching lines @@
 
 TEST(Scope, RemovePrivateIdentifiers) {
   TestWithScope setup;
   setup.scope()->SetValue("a", Value(nullptr, true), nullptr);
   setup.scope()->SetValue("_b", Value(nullptr, true), nullptr);
 
   setup.scope()->RemovePrivateIdentifiers();
   EXPECT_TRUE(setup.scope()->GetValue("a"));
   EXPECT_FALSE(setup.scope()->GetValue("_b"));
 }