diff --git a/core/src/main/scala/org/apache/spark/deploy/worker/DriverRunner.scala b/core/src/main/scala/org/apache/spark/deploy/worker/DriverRunner.scala
index d13e6519bbec22c4578634ee804e4123c83e52db..402ad53f1841b3f016240a2c887a81dbda00bc59 100644
--- a/core/src/main/scala/org/apache/spark/deploy/worker/DriverRunner.scala
+++ b/core/src/main/scala/org/apache/spark/deploy/worker/DriverRunner.scala
@@ -136,8 +136,7 @@ private[spark] class DriverRunner(
   }
 
   /** Continue launching the supplied command until it exits zero or is killed. */
-  def runCommandWithRetry(command: Seq[String], envVars: Seq[(String, String)], baseDir: File)
-      : Unit = {
+  def runCommandWithRetry(command: Seq[String], envVars: Seq[(String, String)], baseDir: File) {
     // Time to wait between submission retries.
     var waitSeconds = 1
     var cleanExit = false
diff --git a/core/src/main/scala/org/apache/spark/deploy/worker/DriverWrapper.scala b/core/src/main/scala/org/apache/spark/deploy/worker/DriverWrapper.scala
deleted file mode 100644
index 92fb0843f887b5ff63535952e1f69389928cc885..0000000000000000000000000000000000000000
--- a/core/src/main/scala/org/apache/spark/deploy/worker/DriverWrapper.scala
+++ /dev/null
@@ -1,8 +0,0 @@
-package org.apache.spark.deploy.worker
-
-object DriverWrapper {
-  def main(args: Array[String]) {
-    val c = Console.readChar()
-    println(s"Char: $c")
-  }
-}