Purge browser cache for dom storage in a smarter way

content/browser/dom_storage/local_storage_database_adapter.h

 // 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.
 
 #ifndef CONTENT_BROWSER_DOM_STORAGE_LOCAL_STORAGE_DATABASE_ADAPTER_H_
 #define CONTENT_BROWSER_DOM_STORAGE_LOCAL_STORAGE_DATABASE_ADAPTER_H_
 
 #include <memory>
 
 #include "base/gtest_prod_util.h"
@@ skipping 12 matching lines @@
 class CONTENT_EXPORT LocalStorageDatabaseAdapter :
       public DOMStorageDatabaseAdapter {
  public:
   explicit LocalStorageDatabaseAdapter(const base::FilePath& path);
   ~LocalStorageDatabaseAdapter() override;
   void ReadAllValues(DOMStorageValuesMap* result) override;
   bool CommitChanges(bool clear_all_first,
                      const DOMStorageValuesMap& changes) override;
   void DeleteFiles() override;
   void Reset() override;
+  void TrimDatabase() override;
 
  protected:
   // Constructor that uses an in-memory sqlite database, for testing.
   LocalStorageDatabaseAdapter();
 
  private:
   FRIEND_TEST_ALL_PREFIXES(DOMStorageAreaTest, BackingDatabaseOpened);
   FRIEND_TEST_ALL_PREFIXES(DOMStorageAreaTest, CommitChangesAtShutdown);
   FRIEND_TEST_ALL_PREFIXES(DOMStorageAreaTest, CommitTasks);
   FRIEND_TEST_ALL_PREFIXES(DOMStorageAreaTest, DeleteOrigin);
   FRIEND_TEST_ALL_PREFIXES(DOMStorageAreaTest, PurgeMemory);
 
   std::unique_ptr<DOMStorageDatabase> db_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalStorageDatabaseAdapter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOM_STORAGE_LOCAL_STORAGE_DATABASE_ADAPTER_H_