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

components/sync/device_info/device_info.cc

Index: components/sync/device_info/device_info.cc
diff --git a/components/sync/device_info/device_info.cc b/components/sync/device_info/device_info.cc
index f2c87336062737546b74371bb0efe204ab67ccaa..70c699c2a4ec976c197eaf0e0cd8d2cd5b882890 100644
--- a/components/sync/device_info/device_info.cc
+++ b/components/sync/device_info/device_info.cc
@@ -96,8 +96,8 @@ bool DeviceInfo::Equals(const DeviceInfo& other) const {
          this->signin_scoped_device_id() == other.signin_scoped_device_id();
 }
 
-base::DictionaryValue* DeviceInfo::ToValue() {
-  base::DictionaryValue* value = new base::DictionaryValue();
+std::unique_ptr<base::DictionaryValue> DeviceInfo::ToValue() {
+  std::unique_ptr<base::DictionaryValue> value(new base::DictionaryValue());
   value->SetString("name", client_name_);
   value->SetString("id", public_id_);
   value->SetString("os", GetOSString());