Don't pass configuration to ObjectWritable in SerializableWritable

Author: JoshRosen

core/src/main/scala/org/apache/spark/SerializableWritable.scala

@@ -19,7 +19,6 @@ package org.apache.spark
 
 import java.io._
 
-import org.apache.hadoop.conf.Configuration
 import org.apache.hadoop.io.ObjectWritable
 import org.apache.hadoop.io.Writable
 
@@ -41,7 +40,6 @@ class SerializableWritable[T <: Writable](@transient var t: T) extends Serializa
   private def readObject(in: ObjectInputStream): Unit = Utils.tryOrIOException {
     in.defaultReadObject()
     val ow = new ObjectWritable()
-    ow.setConf(new Configuration())
     ow.readFields(in)
     t = ow.get().asInstanceOf[T]
   }