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

components/offline_pages/client_policy_controller.cc

 // 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_policy_controller.h"
 
 #include <utility>
 
 #include "base/time/time.h"
-#include "components/offline_pages/client_namespace_constants.h"
 
 using LifetimeType = offline_pages::LifetimePolicy::LifetimeType;
 
 namespace offline_pages {
 
+namespace {
+// TODO(romax): These should be moved to a centralized file.
+// Any changes to these well-known namespaces should also be reflected in
+// OfflinePagesNamespace (histograms.xml) for consistency.
+const char kBookmarkNamespace[] = "bookmark";
+const char kLastNNamespace[] = "last_n";
+}  // namespace
+
 ClientPolicyController::ClientPolicyController() {
   policies_.clear();
   // Manually defining client policies for bookmark and last_n.
   policies_.insert(std::make_pair(
       kBookmarkNamespace,
       MakePolicy(kBookmarkNamespace, LifetimeType::TEMPORARY,
                  base::TimeDelta::FromDays(7), kUnlimitedPages)));
   policies_.insert(std::make_pair(
       kLastNNamespace, MakePolicy(kLastNNamespace, LifetimeType::TEMPORARY,
                                   base::TimeDelta::FromDays(2), 20)));
@@ skipping 19 matching lines @@
 const OfflinePageClientPolicy& ClientPolicyController::GetPolicy(
     const std::string& name_space) const {
   const auto& iter = policies_.find(name_space);
   if (iter != policies_.end())
     return iter->second;
   // Fallback when the namespace isn't defined.
   return policies_.at(kDefaultNamespace);
 }
 
 }  // namespace offline_pages