Include-what-you-use for WrapUnique/MakeUnique.

components/ntp_snippets/remote/remote_suggestions_database.cc

 // Copyright 2016 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/ntp_snippets/remote/remote_suggestions_database.h"
 
 #include <utility>
 
 #include "base/files/file_path.h"
+#include "base/memory/ptr_util.h"
 #include "components/leveldb_proto/proto_database_impl.h"
 #include "components/ntp_snippets/remote/proto/ntp_snippets.pb.h"
 
 using leveldb_proto::ProtoDatabaseImpl;
 
 namespace {
 // Statistics are logged to UMA with this string as part of histogram name. They
 // can all be found under LevelDB.*.NTPSnippets. Changing this needs to
 // synchronize with histograms.xml, AND will also become incompatible with older
 // browsers still reporting the previous values.
@@ skipping 306 matching lines @@
   auto keys_to_remove = base::MakeUnique<std::vector<std::string>>();
   for (const std::string& key : *image_keys) {
     if (references->count(key) == 0) {
       keys_to_remove->emplace_back(key);
     }
   }
   DeleteImages(std::move(keys_to_remove));
 }
 
 }  // namespace ntp_snippets