Convert Pass()→std::move() in //tools

tools/gn/parse_tree_unittest.cc

Index: tools/gn/parse_tree_unittest.cc
diff --git a/tools/gn/parse_tree_unittest.cc b/tools/gn/parse_tree_unittest.cc
index bf6c7161950b28dc0c3aac7ab30e58c2b7d71524..b46114f5ade7014c9bd39e37f8cc7a77b2fc8865 100644
--- a/tools/gn/parse_tree_unittest.cc
+++ b/tools/gn/parse_tree_unittest.cc
@@ -2,11 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "tools/gn/parse_tree.h"
+
 #include <stdint.h>
+#include <utility>
 
 #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/test_with_scope.h"
 
@@ -24,7 +26,7 @@ TEST(ParseTree, Accessor) {
 
   scoped_ptr<IdentifierNode> member_identifier(
       new IdentifierNode(member_token));
-  accessor.set_member(member_identifier.Pass());
+  accessor.set_member(std::move(member_identifier));
 
   // The access should fail because a is not defined.
   Err err;