Switch //components away from base::ListValue::Append(Value*) overload.

components/sync/syncable/write_transaction_info.cc

 // Copyright (c) 2012 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/sync/syncable/write_transaction_info.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
+#include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
 
 namespace syncer {
 namespace syncable {
 
 WriteTransactionInfo::WriteTransactionInfo(
     int64_t id,
     tracked_objects::Location location,
     WriterTag writer,
     ImmutableEntryKernelMutationMap mutations)
     : id(id),
       location_string(location.ToString()),
       writer(writer),
       mutations(mutations) {}
 
 WriteTransactionInfo::WriteTransactionInfo() : id(-1), writer(INVALID) {}
 
 WriteTransactionInfo::WriteTransactionInfo(const WriteTransactionInfo& other) =
     default;
 
 WriteTransactionInfo::~WriteTransactionInfo() {}
 
 base::DictionaryValue* WriteTransactionInfo::ToValue(
     size_t max_mutations_size) const {
   base::DictionaryValue* dict = new base::DictionaryValue();
   dict->SetString("id", base::Int64ToString(id));
   dict->SetString("location", location_string);
   dict->SetString("writer", WriterTagToString(writer));
-  base::Value* mutations_value = NULL;
+  std::unique_ptr<base::Value> mutations_value;
   const size_t mutations_size = mutations.Get().size();
   if (mutations_size <= max_mutations_size) {
     mutations_value = EntryKernelMutationMapToValue(mutations.Get());
   } else {
-    mutations_value = new base::StringValue(
+    mutations_value = base::MakeUnique<base::StringValue>(
         base::SizeTToString(mutations_size) + " mutations");
   }
-  dict->Set("mutations", mutations_value);
+  dict->Set("mutations", std::move(mutations_value));
   return dict;
 }
 
 }  // namespace syncable
 }  // namespace syncer