leveldb: Add DBTracker for exposing databases to Chrome's memory-infra.

content/browser/service_worker/service_worker_database.cc

 // Copyright 2014 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/service_worker/service_worker_database.h"
 
 #include <utility>
 
 #include "base/files/file_util.h"
 #include "base/lazy_instance.h"
@@ skipping 1106 matching lines @@
   options.reuse_logs = leveldb_env::kDefaultLogReuseOptionValue;
   if (IsDatabaseInMemory()) {
     env_.reset(leveldb::NewMemEnv(leveldb::Env::Default()));
     options.env = env_.get();
   } else {
     options.env = g_service_worker_env.Pointer();
   }
 
   leveldb::DB* db = NULL;
   Status status = LevelDBStatusToStatus(
-      leveldb::DB::Open(options, path_.AsUTF8Unsafe(), &db));
+      leveldb_env::DBRegistry::Open(options, path_.AsUTF8Unsafe(), &db));
   HandleOpenResult(FROM_HERE, status);
   if (status != STATUS_OK) {
     DCHECK(!db);
     // TODO(nhiroki): Should we retry to open the database?
     return status;
   }
   db_.reset(db);
 
   int64_t db_version;
   status = ReadDatabaseVersion(&db_version);
@@ skipping 582 matching lines @@
   if (status != STATUS_OK)
     Disable(from_here, status);
   ServiceWorkerMetrics::CountWriteDatabaseResult(status);
 }
 
 bool ServiceWorkerDatabase::IsDatabaseInMemory() const {
   return path_.empty();
 }
 
 }  // namespace content