Remove incorrect optimization in LevelDBWrapperImpl::DeleteAll().

content/browser/leveldb_wrapper_impl.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/leveldb_wrapper_impl.h"
 
 #include "base/bind.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/leveldb/public/cpp/util.h"
@@ skipping 168 matching lines @@
   bytes_used_ -= key.size() + old_value.size();
   observers_.ForAllPtrs(
       [&key, &source, &old_value](mojom::LevelDBObserver* observer) {
         observer->KeyDeleted(key, old_value, source);
       });
   callback.Run(true);
 }
 
 void LevelDBWrapperImpl::DeleteAll(const std::string& source,
                                    const DeleteAllCallback& callback) {
-  if (!map_ && !on_load_complete_tasks_.empty()) {
+  if (!map_) {
     LoadMap(
         base::Bind(&LevelDBWrapperImpl::DeleteAll, base::Unretained(this),
                     source, callback));
     return;
   }
 
-  if (database_ && (!map_ || !map_->empty())) {
+  if (map_->empty()) {
+    callback.Run(true);
+    return;
+  }
+
+  if (database_) {
     CreateCommitBatchIfNeeded();
     commit_batch_->clear_all_first = true;
     commit_batch_->changed_keys.clear();
   }
-  if (!map_)
-    map_.reset(new ValueMap);
 
   map_->clear();
   bytes_used_ = 0;
   observers_.ForAllPtrs(
       [&source](mojom::LevelDBObserver* observer) {
         observer->AllDeleted(source);
       });
   callback.Run(true);
 }
 
@@ skipping 210 matching lines @@
                               weak_ptr_factory_.GetWeakPtr()));
 }
 
 void LevelDBWrapperImpl::OnCommitComplete(leveldb::mojom::DatabaseError error) {
   --commit_batches_in_flight_;
   StartCommitTimer();
   delegate_->DidCommit(error);
 }
 
 }  // namespace content