Make //crypto factories return std::unique_ptr<>s

components/crx_file/crx_file.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 "components/crx_file/crx_file.h"
 
 #include "base/base64.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_file.h"
@@ skipping 93 matching lines @@
 // static
 CrxFile::ValidateError CrxFile::ValidateSignature(
     const base::FilePath& crx_path,
     const std::string& expected_hash,
     std::string* public_key,
     std::string* extension_id,
     CrxFile::Header* header_out) {
   base::ScopedFILE file(base::OpenFile(crx_path, "rb"));
   std::unique_ptr<crypto::SecureHash> hash;
   if (!expected_hash.empty())
-    hash.reset(crypto::SecureHash::Create(crypto::SecureHash::SHA256));
+    hash = crypto::SecureHash::Create(crypto::SecureHash::SHA256);
 
   if (!file.get())
     return ValidateError::CRX_FILE_NOT_READABLE;
 
   CrxFile::Header header;
   size_t len = ReadAndHash(&header, sizeof(header), 1, file.get(), hash.get());
   if (len != sizeof(header))
     return ValidateError::CRX_HEADER_INVALID;
   if (header_out)
     *header_out = header;
@@ skipping 86 matching lines @@
   else if (header.signature_size > kMaxSignatureSize)
     *error = kInvalidSignatureTooLarge;
   else if (header.signature_size == 0)
     *error = kInvalidSignatureTooSmall;
   else
     valid = true;
   return valid;
 }
 
 }  // namespace crx_file