Use leveldb_env::OpenDB() to open leveldb databases.

chrome/browser/android/history_report/usage_reports_buffer_backend.cc

Index: chrome/browser/android/history_report/usage_reports_buffer_backend.cc
diff --git a/chrome/browser/android/history_report/usage_reports_buffer_backend.cc b/chrome/browser/android/history_report/usage_reports_buffer_backend.cc
index c8214a0567f9aa9e067dc01f79eb02fc7763f204..6a1aa49a883fd0a2fe5698a25f542144a8b6cf96 100644
--- a/chrome/browser/android/history_report/usage_reports_buffer_backend.cc
+++ b/chrome/browser/android/history_report/usage_reports_buffer_backend.cc
@@ -37,19 +37,17 @@ bool UsageReportsBufferBackend::Init() {
   options.create_if_missing = true;
   options.max_open_files = 0;  // Use minimum number of files.
   std::string path = db_file_name_.value();
-  leveldb::DB* db = NULL;
-  leveldb::Status status = leveldb::DB::Open(options, path, &db);
+  leveldb::Status status = leveldb_env::OpenDB(options, path, &db_);
   UMA_HISTOGRAM_ENUMERATION("LevelDB.Open.UsageReportsBufferBackend",
                             leveldb_env::GetLevelDBStatusUMAValue(status),
                             leveldb_env::LEVELDB_STATUS_MAX);
   if (status.IsCorruption()) {
     LOG(ERROR) << "Deleting corrupt database";
     base::DeleteFile(db_file_name_, true);
-    status = leveldb::DB::Open(options, path, &db);
+    status = leveldb_env::OpenDB(options, path, &db_);
   }
   if (status.ok()) {
-    CHECK(db);
-    db_.reset(db);
+    CHECK(db_);
     return true;
   }
   LOG(WARNING) << "Unable to open " << path << ": "