[SalesForce] Compilation error while using getDeveloperName() of class Schema.RecordTypeInfo

I have the following block of code and when i execute it from the developer console using anonymous window it is working fine without any error, But it's strange when i copy the same thing in apex class it is giving an compilation error.

Map<Id, Schema.RecordTypeInfo> recordTypeByIdMap = Schema.SObjectType.Contact.getRecordTypeInfosById();
Map<String,String> conversionMap = new Map<String,String>();
for(String r:recordTypeByIdMap.keySet())
{    
    if(!recordTypeByIdMap.get(r).getDeveloperName().startsWithIgnoreCase('Create_'))
    {
        conversionMap.put('Create_'+recordTypeByIdMap.get(r).getDeveloperName(),r);
    }
}
System.debug('-------------'+conversionMap);

And here is the error I am getting after copying same code the apex class:

"Method does not exist or incorrect signature: void getDeveloperName()
from the type Schema.RecordTypeInfo"

Let me know anyone else has faced the same error or someone can give some feasible solution.