Revert of IndexedDB: Optimize range deletion operations (e.g. clearing a store)

content/browser/indexed_db/leveldb/leveldb_transaction.cc

Index: content/browser/indexed_db/leveldb/leveldb_transaction.cc
diff --git a/content/browser/indexed_db/leveldb/leveldb_transaction.cc b/content/browser/indexed_db/leveldb/leveldb_transaction.cc
index 76a7403ba5b2e91928040a3c36c8157918bd60cc..016e7dea72b90ed23f1247f28813119d1f615f56 100644
--- a/content/browser/indexed_db/leveldb/leveldb_transaction.cc
+++ b/content/browser/indexed_db/leveldb/leveldb_transaction.cc
@@ -25,7 +25,7 @@
       data_(data_comparator_),
       finished_(false) {}
 
-LevelDBTransaction::Record::Record() {}
+LevelDBTransaction::Record::Record() : deleted(false) {}
 LevelDBTransaction::Record::~Record() {}
 
 LevelDBTransaction::~LevelDBTransaction() {}
@@ -58,29 +58,6 @@
 bool LevelDBTransaction::Remove(const StringPiece& key) {
   std::string empty;
   return !Set(key, &empty, true);
-}
-
-leveldb::Status LevelDBTransaction::RemoveRange(const StringPiece& begin,
-                                                const StringPiece& end,
-                                                bool upper_open) {
-  IDB_TRACE("LevelDBTransaction::RemoveRange");
-  data_.erase(data_.lower_bound(begin), data_.lower_bound(end));
-  if (!upper_open)
-    data_.erase(end);
-  std::unique_ptr<LevelDBIterator> it = CreateIterator();
-  leveldb::Status s;
-  for (s = it->Seek(begin);
-       s.ok() && it->IsValid() &&
-       (upper_open ? comparator_->Compare(it->Key(), end) < 0
-                   : comparator_->Compare(it->Key(), end) <= 0);
-       s = it->Next()) {
-    std::unique_ptr<Record> record = base::MakeUnique<Record>();
-    record->key = it->Key().as_string();
-    record->deleted = true;
-    data_[record->key] = std::move(record);
-  }
-  NotifyIterators();
-  return s;
 }
 
 leveldb::Status LevelDBTransaction::Get(const StringPiece& key,