printing: Use MD5DigestToBase16() to get a human-readable hexadecimal string.

printing/image.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.
 
 #include "printing/image.h"
 
 #include <algorithm>
 
 #include "base/files/file_util.h"
 #include "base/md5.h"
@@ skipping 37 matching lines @@
       row_length_(image.row_length_),
       data_(image.data_),
       ignore_alpha_(image.ignore_alpha_) {
 }
 
 Image::~Image() {}
 
 std::string Image::checksum() const {
   base::MD5Digest digest;
   base::MD5Sum(&data_[0], data_.size(), &digest);
-  return base::HexEncode(&digest, sizeof(digest));
+  return base::MD5DigestToBase16(digest);
 }
 
 bool Image::SaveToPng(const base::FilePath& filepath) const {
   DCHECK(!data_.empty());
   std::vector<unsigned char> compressed;
   bool success = gfx::PNGCodec::Encode(&*data_.begin(),
                                        gfx::PNGCodec::FORMAT_BGRA,
                                        size_,
                                        row_length_,
                                        true,
@@ skipping 82 matching lines @@
 bool Image::LoadMetafile(const std::string& data) {
   DCHECK(!data.empty());
   PdfMetafileSkia metafile;
   if (!metafile.InitFromData(data.data(),
                              base::checked_cast<uint32>(data.size())))
     return false;
   return LoadMetafile(metafile);
 }
 
 }  // namespace printing