Fix Flaky DeleteSchedulerTest::ImmediateDeleteOn25PercDBSize
Summary: In this test we are deleting 100 files, and we are expecting DeleteScheduler to delete 26 files in the background and 74 files immediately in the foreground The main purpose of the test is to make sure that we delete files in foreground thread, which is verified in line 546 But sometimes we may end up with 26 files or 25 files in the trash directory because the background thread may be slow and not be able to delete the first file fast enough, so sometimes this test fail. Remove ``` ASSERT_EQ(CountFilesInDir(trash_dir_), 25); ``` Since it does not have any benefit any way Closes https://github.com/facebook/rocksdb/pull/2618 Differential Revision: D5458674 Pulled By: IslamAbdelRahman fbshipit-source-id: 5556a9edfa049db71dce80b8e6ae0fdd25e1e74e
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