Convert //tools to use std::unique_ptr

tools/gn/string_utils.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 <stddef.h>
 #include <cctype>
 
 #include "base/strings/string_number_conversions.h"
@@ skipping 63 matching lines @@
     // The error will point into our temporary buffer, rewrite it to refer
     // to the original token. This will make the location information less
     // precise, but generally there won't be complicated things in string
     // interpolations.
     *err = ErrInsideStringToken(token, begin_offset, end_offset - begin_offset,
                                 err->message(), err->help_text());
     return false;
   }
 
   // Parse.
-  scoped_ptr<ParseNode> node = Parser::ParseExpression(tokens, err);
+  std::unique_ptr<ParseNode> node = Parser::ParseExpression(tokens, err);
   if (err->has_error()) {
     // Rewrite error as above.
     *err = ErrInsideStringToken(token, begin_offset, end_offset - begin_offset,
                                 err->message(), err->help_text());
     return false;
   }
   if (!(node->AsIdentifier() || node->AsAccessor())) {
     *err = ErrInsideStringToken(token, begin_offset, end_offset - begin_offset,
         "Invalid string interpolation.",
         "The thing inside the ${} must be an identifier ${foo},\n"
@@ skipping 241 matching lines @@
   base::StringPiece result;
   for (base::StringPiece word : words) {
     size_t distance = EditDistance(word, text, kMaxValidEditDistance);
     if (distance < min_distance) {
       min_distance = distance;
       result = word;
     }
   }
   return result;
 }