Reporting: Remove persistence for now.

net/reporting/reporting_delegate.cc

Index: net/reporting/reporting_delegate.cc
diff --git a/net/reporting/reporting_delegate.cc b/net/reporting/reporting_delegate.cc
deleted file mode 100644
index cef5bafa28cb0ccd0ac11541bd345be5caee5fd6..0000000000000000000000000000000000000000
--- a/net/reporting/reporting_delegate.cc
+++ /dev/null
@@ -1,13 +0,0 @@
-// 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.
-
-#include "net/reporting/reporting_delegate.h"
-
-namespace net {
-
-ReportingDelegate::~ReportingDelegate() {}
-
-ReportingDelegate::ReportingDelegate() {}
-
-}  // namespace net