Currently, the following pattern is used repeatedly in components/previews/core/previews_experiments.cc:

int duration;
if (!base::StringToInt(param_value, &duration)) {
  return base::TimeDelta::FromDays(<some default value>);
}
return base::TimeDelta::FromDays(duration);


This could be more efficiently written as:

int duration;
if (!base::StringToInt(param_value, &duration)) {
  duration = <some default value>;
}
return base::TimeDelta::FromDays(duration);

This change will reduce binary size slightly and it will make the code somewhat simpler and easier to read.