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

components/sync/engine/attachments/on_disk_attachment_store.cc

Index: components/sync/engine/attachments/on_disk_attachment_store.cc
diff --git a/components/sync/engine/attachments/on_disk_attachment_store.cc b/components/sync/engine/attachments/on_disk_attachment_store.cc
index 5ad339d4ff12b892a9c3139ae2c548e333a049ce..127da4cb9432ab9b092c4aa27462ca7836377c48 100644
--- a/components/sync/engine/attachments/on_disk_attachment_store.cc
+++ b/components/sync/engine/attachments/on_disk_attachment_store.cc
@@ -365,7 +365,7 @@ AttachmentStore::Result OnDiskAttachmentStore::OpenOrCreate(
   // TODO(pavely): crbug/424287 Consider adding info_log, block_cache and
   // filter_policy to options.
   leveldb::Status status =
-      leveldb::DB::Open(options, leveldb_path.AsUTF8Unsafe(), &db_raw);
+      leveldb_env::DBRegistry::Open(options, leveldb_path.AsUTF8Unsafe(), &db_raw);
   if (!status.ok()) {
     DVLOG(1) << "DB::Open failed: status=" << status.ToString()
              << ", path=" << path.AsUTF8Unsafe();