Convert //tools to use std::unique_ptr

tools/gn/command_format.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 <stddef.h>
 
 #include <sstream>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
@@ skipping 964 matching lines @@
   file.SetContents(input);
   Err err;
   // Tokenize.
   std::vector<Token> tokens = Tokenizer::Tokenize(&file, &err);
   if (err.has_error()) {
     err.PrintToStdout();
     return false;
   }
 
   // Parse.
-  scoped_ptr<ParseNode> parse_node = Parser::Parse(tokens, &err);
+  std::unique_ptr<ParseNode> parse_node = Parser::Parse(tokens, &err);
   if (err.has_error()) {
     err.PrintToStdout();
     return false;
   }
 
   DoFormat(parse_node.get(), dump_tree, output);
   return true;
 }
 
 int RunFormat(const std::vector<std::string>& args) {
@@ skipping 72 matching lines @@
       }
     } else {
       printf("%s", output_string.c_str());
     }
   }
 
   return 0;
 }
 
 }  // namespace commands