Convert //tools to use std::unique_ptr

tools/imagediff/image_diff.cc

 // Copyright (c) 2011 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.
 
 // This file input format is based loosely on
 // Tools/DumpRenderTree/ImageDiff.m
 
 // The exact format of this tool's output to stdout is important, to match
 // what the run-webkit-tests script expects.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
 #include <iostream>
+#include <memory>
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/process/memory.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "tools/imagediff/image_diff_png.h"
 
 #if defined(OS_WIN)
 #include "windows.h"
 #endif
@@ skipping 42 matching lines @@
   const unsigned char* data() const {
     return &data_.front();
   }
 
   // Creates the image from stdin with the given data length. On success, it
   // will return true. On failure, no other methods should be accessed.
   bool CreateFromStdin(size_t byte_length) {
     if (byte_length == 0)
       return false;
 
-    scoped_ptr<unsigned char[]> source(new unsigned char[byte_length]);
+    std::unique_ptr<unsigned char[]> source(new unsigned char[byte_length]);
     if (fread(source.get(), 1, byte_length, stdin) != byte_length)
       return false;
 
     if (!image_diff_png::DecodePNG(source.get(), byte_length,
                                    &data_, &w_, &h_)) {
       Clear();
       return false;
     }
     return true;
   }
@@ skipping 346 matching lines @@
                         base::FilePath(args[2]));
     }
   } else if (args.size() == 2) {
     return CompareImages(
         base::FilePath(args[0]), base::FilePath(args[1]), histograms);
   }
 
   PrintHelp();
   return kStatusError;
 }