Re-write many calls to WrapUnique() with MakeUnique()

components/drive/resource_metadata_storage.cc

 // Copyright 2013 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/drive/resource_metadata_storage.h"
 
 #include <stddef.h>
 
 #include <map>
 #include <set>
@@ skipping 808 matching lines @@
                                                       &batch);
   return LevelDBStatusToFileError(status);
 }
 
 std::unique_ptr<ResourceMetadataStorage::Iterator>
 ResourceMetadataStorage::GetIterator() {
   base::ThreadRestrictions::AssertIOAllowed();
 
   std::unique_ptr<leveldb::Iterator> it(
       resource_map_->NewIterator(leveldb::ReadOptions()));
-  return base::WrapUnique(new Iterator(std::move(it)));
+  return base::MakeUnique<Iterator>(std::move(it));
 }
 
 FileError ResourceMetadataStorage::GetChild(const std::string& parent_id,
                                             const std::string& child_name,
                                             std::string* child_id) {
   base::ThreadRestrictions::AssertIOAllowed();
   DCHECK(!parent_id.empty());
   DCHECK(!child_name.empty());
 
   const leveldb::Status status =
@@ skipping 221 matching lines @@
     RecordCheckValidityFailure(
         CHECK_VALIDITY_FAILURE_CHILD_ENTRY_COUNT_MISMATCH);
     return false;
   }
 
   return true;
 }
 
 }  // namespace internal
 }  // namespace drive