Reporting: Remove persistence for now.

net/reporting/reporting_delegate.h

-// Copyright 2017 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.
-
-#ifndef NET_REPORTING_REPORTING_DELEGATE_H_
-#define NET_REPORTING_REPORTING_DELEGATE_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "net/base/net_export.h"
-
-namespace base {
-class Value;
-}  // namespace base
-
-namespace net {
-
-// Delegate for things that the Reporting system can't do by itself, like
-// persisting data across embedder restarts.
-class NET_EXPORT ReportingDelegate {
- public:
-  virtual ~ReportingDelegate();
-
-  // Gets previously persisted data, if any is available. Returns a null pointer
-  // if no data is available. Can be called any number of times.
-  virtual std::unique_ptr<const base::Value> GetPersistedData() = 0;
-
-  // Sets data to be persisted across embedder restarts. Ideally, this data will
-  // be returned by any future calls to GetPersistedData() in this or future
-  // sessions (until newer data is persisted), but no guarantee is made, since
-  // the underlying persistence mechanism may or may not be reliable.
-  virtual void PersistData(
-      std::unique_ptr<const base::Value> persisted_data) = 0;
-
- protected:
-  ReportingDelegate();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ReportingDelegate);
-};
-
-}  // namespace net
-
-#endif  // NET_REPORTING_REPORTING_DELEGATE_H_