Revert of Record offline histograms with suffix via Histogram::FactoryGet

components/offline_pages/client_namespace_constants.cc

Index: components/offline_pages/client_namespace_constants.cc
diff --git a/components/offline_pages/client_namespace_constants.cc b/components/offline_pages/client_namespace_constants.cc
deleted file mode 100644
index 508db279a458988a0913974e85d0c453dbf90ab5..0000000000000000000000000000000000000000
--- a/components/offline_pages/client_namespace_constants.cc
+++ /dev/null
@@ -1,14 +0,0 @@
-// Copyright 2016 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 "components/offline_pages/client_namespace_constants.h"
-
-namespace offline_pages {
-
-const char kBookmarkNamespace[] = "bookmark";
-const char kLastNNamespace[] = "last_n";
-
-const char kDefaultNamespace[] = "default";
-
-}  // namespace offline_pages