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

extensions/browser/value_store/lazy_leveldb.cc

Index: extensions/browser/value_store/lazy_leveldb.cc
diff --git a/extensions/browser/value_store/lazy_leveldb.cc b/extensions/browser/value_store/lazy_leveldb.cc
index ca5501d075f90b056b7d8a160d15dbf76e26d90e..0eac5fd31333c23dab09db2e95d8eb4a76ff471a 100644
--- a/extensions/browser/value_store/lazy_leveldb.cc
+++ b/extensions/browser/value_store/lazy_leveldb.cc
@@ -184,13 +184,13 @@ ValueStore::BackingStoreRestoreStatus LazyLevelDb::FixCorruption(
   leveldb::DB* db = nullptr;
   if (s.ok()) {
     restore_status = ValueStore::DB_RESTORE_REPAIR_SUCCESS;
-    s = leveldb::DB::Open(open_options_, db_path_.AsUTF8Unsafe(), &db);
+    s = leveldb_env::DBRegistry::Open(open_options_, db_path_.AsUTF8Unsafe(), &db);
   }
 
   if (!s.ok()) {
     if (DeleteDbFile()) {
       restore_status = ValueStore::DB_RESTORE_DELETE_SUCCESS;
-      s = leveldb::DB::Open(open_options_, db_path_.AsUTF8Unsafe(), &db);
+      s = leveldb_env::DBRegistry::Open(open_options_, db_path_.AsUTF8Unsafe(), &db);
     } else {
       restore_status = ValueStore::DB_RESTORE_DELETE_FAILURE;
     }
@@ -235,7 +235,7 @@ ValueStore::Status LazyLevelDb::EnsureDbIsOpen() {
 
   leveldb::DB* db = nullptr;
   leveldb::Status ldb_status =
-      leveldb::DB::Open(open_options_, db_path_.AsUTF8Unsafe(), &db);
+      leveldb_env::DBRegistry::Open(open_options_, db_path_.AsUTF8Unsafe(), &db);
   open_histogram_->Add(leveldb_env::GetLevelDBStatusUMAValue(ldb_status));
   ValueStore::Status status = ToValueStoreError(ldb_status);
   if (ldb_status.ok()) {