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

components/offline_pages/client_policy_controller_unittest.cc

Index: components/offline_pages/client_policy_controller_unittest.cc
diff --git a/components/offline_pages/client_policy_controller_unittest.cc b/components/offline_pages/client_policy_controller_unittest.cc
index 918de56d593bb0cecacdc8e0fe55917f63604417..6bd4faeffd7578b22c51d354fddf595140fd5eb1 100644
--- a/components/offline_pages/client_policy_controller_unittest.cc
+++ b/components/offline_pages/client_policy_controller_unittest.cc
@@ -6,7 +6,6 @@
 
 #include "base/bind.h"
 #include "base/time/time.h"
-#include "components/offline_pages/client_namespace_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using LifetimeType = offline_pages::LifetimePolicy::LifetimeType;
@@ -14,6 +13,8 @@
 namespace offline_pages {
 
 namespace {
+const char kBookmarkNamespace[] = "bookmark";
+const char kLastNNamespace[] = "last_n";
 const char kUndefinedNamespace[] = "undefined";
 
 bool isTemporary(const OfflinePageClientPolicy& policy) {