Rename PricingEngine to PremiumPricingEngine

This properly reflects the fact that other, separate things will now
be responsible both for EAP and for per-TLD custom pricing.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=124558165

java/google/registry/model/pricing/StaticPremiumListPricingEngine.java

@@ -35,7 +35,7 @@ import org.joda.time.DateTime;
 import javax.inject.Inject;
 
 /** A premium list pricing engine that stores static pricing information in Datastore entities. */
-public final class StaticPremiumListPricingEngine implements PricingEngine {
+public final class StaticPremiumListPricingEngine implements PremiumPricingEngine {
 
   @Inject StaticPremiumListPricingEngine() {}
 
@@ -61,7 +61,6 @@ public final class StaticPremiumListPricingEngine implements PricingEngine {
         premiumPrice.isPresent(),
         premiumPrice.or(registry.getStandardCreateCost()),
         premiumPrice.or(registry.getStandardRenewCost(priceTime)),
-        Optional.<Money>absent(),
         Optional.<String>fromNullable(feeClass));
   }
 }