Revert "uptake IterationType (#640)"

This reverts commit b70b62e.

Author: pjfanning

src/main/scala/com/fasterxml/jackson/module/scala/modifiers/ScalaTypeModifier.scala

@@ -18,7 +18,6 @@ class ScalaTypeModifier extends TypeModifier {
   private val longClass = classOf[Long]
   private val immutableLongMapClass = classOf[immutable.LongMap[_]]
   private val mutableLongMapClass = classOf[mutable.LongMap[_]]
-  private val iteratorClass = classOf[Iterator[_]]
   private val iterableOnceClass = classOf[IterableOnce[_]]
 
   override def modifyType(javaType: JavaType,
@@ -40,8 +39,6 @@ class ScalaTypeModifier extends TypeModifier {
       } else {
         MapLikeType.upgradeFrom(javaType, javaType.containedTypeOrUnknown(0), javaType.containedTypeOrUnknown(1))
       }
-    } else if (javaType.isTypeOrSubTypeOf(iteratorClass)) {
-      IterationType.upgradeFrom(javaType, javaType.containedTypeOrUnknown(0))
     } else if (javaType.isTypeOrSubTypeOf(iterableOnceClass)) {
       CollectionLikeType.upgradeFrom(javaType, javaType.containedTypeOrUnknown(0))
     } else if (javaType.isTypeOrSubTypeOf(eitherClass)) {

src/main/scala/com/fasterxml/jackson/module/scala/ser/IteratorSerializerModule.scala

@@ -3,9 +3,10 @@ package module.scala
 package ser
 
 import java.{lang => jl}
+
 import com.fasterxml.jackson.core.JsonGenerator
 import com.fasterxml.jackson.databind._
-import com.fasterxml.jackson.databind.`type`.{CollectionLikeType, IterationType}
+import com.fasterxml.jackson.databind.`type`.CollectionLikeType
 import com.fasterxml.jackson.databind.jsontype.TypeSerializer
 import com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase
 import com.fasterxml.jackson.databind.ser.Serializers
@@ -74,21 +75,6 @@ private object ScalaIteratorSerializerResolver extends Serializers.Base {
     if (!SCALAITERATOR_CLASS.isAssignableFrom(rawClass) || JSONSERIALIZABLE_CLASS.isAssignableFrom(rawClass)) None.orNull
     else new UnresolvedIteratorSerializer(rawClass, collectionType.getContentType, false, elementTypeSerializer, elementSerializer)
   }
-
-  override def findSerializer(config: SerializationConfig, `type`: JavaType, beanDesc: BeanDescription): JsonSerializer[_] = {
-    `type` match {
-      case it: IterationType => {
-        val rawClass = it.getRawClass
-        if (JSONSERIALIZABLE_CLASS.isAssignableFrom(rawClass)) {
-          None.orNull
-        } else {
-          new UnresolvedIteratorSerializer(it.getRawClass, config.constructType(classOf[AnyRef]), false,
-            None.orNull, None.orNull)
-        }
-      }
-      case _ => None.orNull
-    }
-  }
 }
 
 trait IteratorSerializerModule extends IteratorTypeModifierModule {