Remove no-op serializer :)

core/src/main/scala/org/apache/spark/serializer/Serializer.scala

@@ -142,48 +142,3 @@ abstract class DeserializationStream {
     }
   }
 }
-
-
-class NoOpReadSerializer(conf: SparkConf) extends Serializer with Serializable {
-  override def newInstance(): SerializerInstance = {
-    new NoOpReadSerializerInstance()
-  }
-}
-
-private[spark] class NoOpReadSerializerInstance()
-  extends SerializerInstance {
-
-  override def serialize[T: ClassTag](t: T): ByteBuffer = {
-    val bos = new ByteArrayOutputStream()
-    val out = serializeStream(bos)
-    out.writeObject(t)
-    out.close()
-    ByteBuffer.wrap(bos.toByteArray)
-  }
-
-  override def deserialize[T: ClassTag](bytes: ByteBuffer): T = {
-    null.asInstanceOf[T]
-  }
-
-  override def deserialize[T: ClassTag](bytes: ByteBuffer, loader: ClassLoader): T = {
-    null.asInstanceOf[T]
-  }
-
-  override def serializeStream(s: OutputStream): SerializationStream = {
-    new JavaSerializationStream(s, 100)
-  }
-
-  override def deserializeStream(s: InputStream): DeserializationStream = {
-    new NoOpDeserializationStream(s, Utils.getContextOrSparkClassLoader)
-  }
-
-  def deserializeStream(s: InputStream, loader: ClassLoader): DeserializationStream = {
-    new NoOpDeserializationStream(s, loader)
-  }
-}
-
-private[spark] class NoOpDeserializationStream(in: InputStream, loader: ClassLoader)
-  extends DeserializationStream {
-  def readObject[T: ClassTag](): T = throw new EOFException()
-  def close() { }
-}