remove unnecessary changes

Author: CodingCat

core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala

@@ -57,7 +57,7 @@ class DAGScheduler(
     private[scheduler] val listenerBus: LiveListenerBus,
     mapOutputTracker: MapOutputTrackerMaster,
     blockManagerMaster: BlockManagerMaster,
-    private[scheduler] val env: SparkEnv)
+    env: SparkEnv)
   extends Logging {
 
   import DAGScheduler._

core/src/test/scala/org/apache/spark/scheduler/DAGSchedulerSuite.scala

@@ -24,7 +24,6 @@ import scala.language.reflectiveCalls
 import akka.actor._
 import akka.testkit.{ImplicitSender, TestKit, TestActorRef}
 import org.scalatest.{BeforeAndAfter, FunSuite}
-import org.scalatest.matchers.MustMatchers
 
 import org.apache.spark._
 import org.apache.spark.rdd.RDD
@@ -39,7 +38,7 @@ class BuggyDAGEventProcessActor extends Actor {
 }
 
 class DAGSchedulerSuite extends TestKit(ActorSystem("DAGSchedulerSuite")) with FunSuite
-  with MustMatchers with ImplicitSender with BeforeAndAfter with LocalSparkContext {
+  with ImplicitSender with BeforeAndAfter with LocalSparkContext {
 
   val conf = new SparkConf
   /** Set of TaskSets the DAGScheduler has requested executed. */