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

chrome/browser/android/history_report/delta_file_backend_leveldb.cc

 // Copyright 2015 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 "chrome/browser/android/history_report/delta_file_backend_leveldb.h"
 
 #include <inttypes.h>
 
 #include "base/files/file_util.h"
 #include "base/logging.h"
@@ skipping 178 matching lines @@
   if (status.ok())
     return true;
   LOG(WARNING) << "Recreate failed: " << status.ToString();
   return false;
 }
 
 std::unique_ptr<std::vector<DeltaFileEntryWithData>> DeltaFileBackend::Query(
     int64_t last_seq_no,
     int32_t limit) {
   if (!EnsureInitialized())
-    return base::WrapUnique(new std::vector<DeltaFileEntryWithData>());
+    return base::MakeUnique<std::vector<DeltaFileEntryWithData>>();
   std::string start;
   base::SStringPrintf(&start, "%" PRId64, last_seq_no + 1);
   leveldb::ReadOptions options;
   std::unique_ptr<leveldb::Iterator> db_it(db_->NewIterator(options));
   std::unique_ptr<std::vector<DeltaFileEntryWithData>> result(
       new std::vector<DeltaFileEntryWithData>());
   int32_t count = 0;
   for (db_it->Seek(start); db_it->Valid() && count < limit; db_it->Next()) {
     DeltaFileEntry entry;
     leveldb::Slice value_slice = db_it->value();
@@ skipping 22 matching lines @@
   leveldb::ReadOptions options;
   std::unique_ptr<leveldb::Iterator> db_it(db_->NewIterator(options));
   int num_entries = 0;
   for (db_it->SeekToFirst(); db_it->Valid(); db_it->Next()) num_entries++;
   dump.append(base::IntToString(num_entries));
   dump.append("]");
   return dump;
 }
 
 }  // namespace history_report