Fix Flaky DBCompactionTest.SkipStatsUpdateTest

Summary: DBCompactionTest.SkipStatsUpdateTest sometimes fails. I don't see any verification related to the deletes issued. Remove them to avoid the uncertainty.

Test Plan: Run the test.

Reviewers: IslamAbdelRahman, andrewkr, yhchiang

Reviewed By: yhchiang

Subscribers: leveldb, andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D59613

db/db_compaction_test.cc

@@ -212,8 +212,8 @@ TEST_P(DBCompactionTestWithParam, CompactionDeletionTrigger) {
 }
 
 TEST_F(DBCompactionTest, SkipStatsUpdateTest) {
-  // This test verify UpdateAccumulatedStats is not on by observing
-  // the compaction behavior when there are many of deletion entries.
+  // This test verify UpdateAccumulatedStats is not on
+  // if options.skip_stats_update_on_db_open = true
   // The test will need to be updated if the internal behavior changes.
 
   Options options = DeletionTriggerOptions(CurrentOptions());
@@ -230,10 +230,6 @@ TEST_F(DBCompactionTest, SkipStatsUpdateTest) {
   dbfull()->TEST_WaitForFlushMemTable();
   dbfull()->TEST_WaitForCompact();
 
-  for (int k = 0; k < kTestSize; ++k) {
-    ASSERT_OK(Delete(Key(k)));
-  }
-
   // Reopen the DB with stats-update disabled
   options.skip_stats_update_on_db_open = true;
   env_->random_file_open_counter_.store(0);