Dagger, meet Flows. Flows, meet Dagger.

Daggerizes all of the EPP flows. This does not change anything yet
about the flows themselves, just how they are invoked, but after
this CL it's safe to @Inject things into flow classes.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=125382478

java/google/registry/flows/domain/DomainDeleteFlow.java

@@ -55,6 +55,8 @@ import org.joda.money.CurrencyUnit;
 import org.joda.money.Money;
 import org.joda.time.DateTime;
 
+import javax.inject.Inject;
+
 /**
  * An EPP flow that deletes a domain resource.
  *
@@ -73,6 +75,8 @@ public class DomainDeleteFlow extends ResourceSyncDeleteFlow<DomainResource, Bui
 
   ImmutableList<Credit> credits;
 
+  @Inject DomainDeleteFlow() {}
+
   @Override
   protected void initResourceCreateOrMutateFlow() throws EppException {
     registerExtensions(SecDnsUpdateExtension.class);