Memtables should be deleted appropriately in the unit test.

Summary:
Memtables should be deleted appropriately in the unit test.

Test Plan:

Reviewers:

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Task ID: #

Blame Rev:

db/write_batch_test.cc

@@ -69,7 +69,7 @@ static std::string PrintContents(WriteBatch* b) {
   } else if (count != WriteBatchInternal::Count(b)) {
     state.append("CountMismatch()");
   }
-  mem->Unref();
+  delete mem->Unref();
   return state;
 }
 

table/table_test.cc

@@ -374,10 +374,10 @@ class MemTableConstructor: public Constructor {
     memtable_->Ref();
   }
   ~MemTableConstructor() {
-    memtable_->Unref();
+    delete memtable_->Unref();
   }
   virtual Status FinishImpl(const Options& options, const KVMap& data) {
-    memtable_->Unref();
+    delete memtable_->Unref();
     memtable_ = new MemTable(internal_comparator_, table_factory_);
     memtable_->Ref();
     int seq = 1;
@@ -1289,7 +1289,7 @@ TEST(MemTableTest, Simple) {
   }
 
   delete iter;
-  memtable->Unref();
+  delete memtable->Unref();
 }