leveldb: Reuse manifest (AKA logs) during open.

chrome/browser/sync_file_system/drive_backend/metadata_database.cc

Index: chrome/browser/sync_file_system/drive_backend/metadata_database.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/metadata_database.cc b/chrome/browser/sync_file_system/drive_backend/metadata_database.cc
index 22cd926e2da62e49ef32bba25e5ab44d46e195c4..5d31cf498069020b5428e8968df836fb8a9b5ba1 100644
--- a/chrome/browser/sync_file_system/drive_backend/metadata_database.cc
+++ b/chrome/browser/sync_file_system/drive_backend/metadata_database.cc
@@ -34,6 +34,7 @@
 #include "chrome/browser/sync_file_system/syncable_file_system_util.h"
 #include "google_apis/drive/drive_api_parser.h"
 #include "storage/common/fileapi/file_system_util.h"
+#include "third_party/leveldatabase/env_chromium.h"
 #include "third_party/leveldatabase/src/include/leveldb/db.h"
 #include "third_party/leveldatabase/src/include/leveldb/env.h"
 #include "third_party/leveldatabase/src/include/leveldb/status.h"
@@ -214,6 +215,7 @@ SyncStatusCode OpenDatabase(const base::FilePath& path,
   leveldb::Options options;
   options.max_open_files = 0;  // Use minimum.
   options.create_if_missing = true;
+  options.reuse_logs = leveldb_env::kDefaultLogReuseOptionValue;
   if (env_override)
     options.env = env_override;
   leveldb::DB* db = nullptr;