Purge browser cache for dom storage in a smarter way

content/browser/dom_storage/dom_storage_host.cc

 // Copyright 2013 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 "content/browser/dom_storage/dom_storage_host.h"
 
 #include "content/browser/dom_storage/dom_storage_area.h"
 #include "content/browser/dom_storage/dom_storage_context_impl.h"
 #include "content/browser/dom_storage/dom_storage_namespace.h"
 #include "content/common/dom_storage/dom_storage_types.h"
@@ skipping 37 matching lines @@
 
 bool DOMStorageHost::ExtractAreaValues(
     int connection_id, DOMStorageValuesMap* map) {
   map->clear();
   DOMStorageArea* area = GetOpenArea(connection_id);
   if (!area)
     return false;
   if (!area->IsLoadedInMemory()) {
     DOMStorageNamespace* ns = GetNamespace(connection_id);
     DCHECK(ns);
-    if (ns->CountInMemoryAreas() > kMaxInMemoryStorageAreas) {
-      ns->PurgeMemory(DOMStorageNamespace::PURGE_UNOPENED);
-      if (ns->CountInMemoryAreas() > kMaxInMemoryStorageAreas)
-        ns->PurgeMemory(DOMStorageNamespace::PURGE_AGGRESSIVE);
-    }
+    ns->PurgeMemory(DOMStorageNamespace::PURGE_IF_NEEDED);
   }
   area->ExtractValues(map);
   return true;
 }
 
 unsigned DOMStorageHost::GetAreaLength(int connection_id) {
   DOMStorageArea* area = GetOpenArea(connection_id);
   if (!area)
     return 0;
   return area->Length();
@@ skipping 78 matching lines @@
 }
 
 // NamespaceAndArea
 
 DOMStorageHost::NamespaceAndArea::NamespaceAndArea() {}
 DOMStorageHost::NamespaceAndArea::NamespaceAndArea(
     const NamespaceAndArea& other) = default;
 DOMStorageHost::NamespaceAndArea::~NamespaceAndArea() {}
 
 }  // namespace content