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

extensions/browser/content_verify_job.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 "extensions/browser/content_verify_job.h"
 
 #include <algorithm>
 
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
@@ skipping 78 matching lines @@
     queue_.append(data, count);
     return;
   }
   DCHECK_GE(count, 0);
   int bytes_added = 0;
 
   while (bytes_added < count) {
     if (current_block_ >= hash_reader_->block_count())
       return DispatchFailureCallback(HASH_MISMATCH);
 
-    if (!current_hash_.get()) {
+    if (!current_hash_) {
       current_hash_byte_count_ = 0;
-      current_hash_.reset(
-          crypto::SecureHash::Create(crypto::SecureHash::SHA256));
+      current_hash_ = crypto::SecureHash::Create(crypto::SecureHash::SHA256);
     }
     // Compute how many bytes we should hash, and add them to the current hash.
     int bytes_to_hash =
         std::min(hash_reader_->block_size() - current_hash_byte_count_,
                  count - bytes_added);
     DCHECK_GT(bytes_to_hash, 0);
     current_hash_->Update(data + bytes_added, bytes_to_hash);
     bytes_added += bytes_to_hash;
     current_hash_byte_count_ += bytes_to_hash;
     total_bytes_read_ += bytes_to_hash;
@@ skipping 101 matching lines @@
             << " reason:" << reason;
     failure_callback_.Run(reason);
     failure_callback_.Reset();
   }
   if (g_test_observer)
     g_test_observer->JobFinished(
         hash_reader_->extension_id(), hash_reader_->relative_path(), failed_);
 }
 
 }  // namespace extensions