[DO NOT COMMIT][Offline Pages] Moving Offline Page Cache to cache directory.

components/offline_pages/core/offline_page_storage_manager.cc

Index: components/offline_pages/core/offline_page_storage_manager.cc
diff --git a/components/offline_pages/core/offline_page_storage_manager.cc b/components/offline_pages/core/offline_page_storage_manager.cc
index 1c17729f768a8a9ef7f47b617f86d169f46fe9b6..260bc798867ef6b75b7df07794227530fe0f41d3 100644
--- a/components/offline_pages/core/offline_page_storage_manager.cc
+++ b/components/offline_pages/core/offline_page_storage_manager.cc
@@ -14,10 +14,10 @@
 #include "components/offline_pages/core/offline_page_item.h"
 #include "components/offline_pages/core/offline_page_model.h"
 
-using LifetimeType = offline_pages::LifetimePolicy::LifetimeType;
-
 namespace offline_pages {
 
+using LifetimeType = LifetimePolicy::LifetimeType;
+
 constexpr double constants::kOfflinePageStorageLimit;
 constexpr double constants::kOfflinePageStorageClearThreshold;
 constexpr base::TimeDelta constants::kClearStorageInterval;
@@ -40,9 +40,12 @@ void OfflinePageStorageManager::ClearPagesIfNeeded(
   if (IsInProgress())
     return;
   clear_time_ = clock_->Now();
-  archive_manager_->GetStorageStats(base::Bind(
-      &OfflinePageStorageManager::OnGetStorageStatsDoneForClearingPages,
-      weak_ptr_factory_.GetWeakPtr(), callback));
+  // We only clear temporary offline pages in storage manager.
+  archive_manager_->GetStorageStats(
+      std::set<LifetimeType>({LifetimeType::TEMPORARY}),
+      base::Bind(
+          &OfflinePageStorageManager::OnGetStorageStatsDoneForClearingPages,
+          weak_ptr_factory_.GetWeakPtr(), callback));
 }
 
 void OfflinePageStorageManager::SetClockForTesting(