Remove redundant ROCKSDB_LITE check (#7172)

Summary:
It's already inside of a `#ifdef ROCKSDB_LITE` block.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7172

Reviewed By: gg814

Differential Revision: D22736057

Pulled By: jay-zhuang

fbshipit-source-id: 31f4aa05aba98e2e42fa6f890fa72acf3a0f12f2

db_stress_tool/db_stress_test_base.cc

@@ -1284,7 +1284,6 @@ Status StressTest::TestBackupRestore(
   return s;
 }
 
-#ifndef ROCKSDB_LITE
 Status StressTest::TestApproximateSize(
     ThreadState* thread, uint64_t iteration,
     const std::vector<int>& rand_column_families,
@@ -1326,7 +1325,6 @@ Status StressTest::TestApproximateSize(
   return db_->GetApproximateSizes(
       sao, column_families_[rand_column_families[0]], &range, 1, &result);
 }
-#endif  // ROCKSDB_LITE
 
 Status StressTest::TestCheckpoint(ThreadState* thread,
                                   const std::vector<int>& rand_column_families,