Convert //tools to use std::unique_ptr

tools/gn/header_checker.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 "tools/gn/header_checker.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
@@ skipping 37 matching lines @@
 // an InputFile that must persist as long as the Err does.
 //
 // To make this work, this function creates a clone of the InputFile managed
 // by the InputFileManager so the error can refer to something that
 // persists. This means that the current file contents will live as long as
 // the program, but this is OK since we're erroring out anyway.
 LocationRange CreatePersistentRange(const InputFile& input_file,
                                     const LocationRange& range) {
   InputFile* clone_input_file;
   std::vector<Token>* tokens;  // Don't care about this.
-  scoped_ptr<ParseNode>* parse_root;  // Don't care about this.
+  std::unique_ptr<ParseNode>* parse_root;  // Don't care about this.
 
   g_scheduler->input_file_manager()->AddDynamicInput(
       input_file.name(), &clone_input_file, &tokens, &parse_root);
   clone_input_file->SetContents(input_file.contents());
 
   return LocationRange(Location(clone_input_file,
                                 range.begin().line_number(),
                                 range.begin().column_number(),
                                 -1 /* TODO(scottmg) */),
                        Location(clone_input_file,
@@ skipping 505 matching lines @@
   if (targets_with_other_toolchains.size() +
       targets_with_matching_toolchains.size() > 1)
     msg += "at least one of ";
   msg += "which should somehow be reachable.";
 
   // Danger: must call CreatePersistentRange to put in Err.
   return Err(CreatePersistentRange(source_file, range),
              "Include not allowed.", msg);
 }