Make browsing_data component a layered component

components/browsing_data/conditional_cache_deletion_helper.h

-// 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.
-
-#ifndef COMPONENTS_BROWSING_DATA_CONDITIONAL_CACHE_DELETION_HELPER_H_
-#define COMPONENTS_BROWSING_DATA_CONDITIONAL_CACHE_DELETION_HELPER_H_
-
-#include <memory>
-
-#include "base/callback_forward.h"
-#include "base/message_loop/message_loop.h"
-#include "net/base/completion_callback.h"
-#include "net/base/net_errors.h"
-#include "net/disk_cache/disk_cache.h"
-#include "url/gurl.h"
-
-namespace disk_cache {
-class Entry;
-}
-
-namespace browsing_data {
-
-// Helper to remove http cache data from a StoragePartition.
-class ConditionalCacheDeletionHelper {
- public:
-  // Creates a helper to delete |cache| entries that match the |condition|.
-  // Must be created on the IO thread!
-  ConditionalCacheDeletionHelper(
-      disk_cache::Backend* cache,
-      const base::Callback<bool(const disk_cache::Entry*)>& condition);
-
-  // A convenience method to create a condition matching cache entries whose
-  // last modified time is between |begin_time| (inclusively), |end_time|
-  // (exclusively) and whose URL is matched by the |url_predicate|. Note that
-  // |begin_time| and |end_time| can be null to indicate unbounded time interval
-  // in their respective direction.
-  static base::Callback<bool(const disk_cache::Entry*)>
-  CreateURLAndTimeCondition(
-      const base::Callback<bool(const GURL&)>& url_predicate,
-      const base::Time& begin_time,
-      const base::Time& end_time);
-
-  // Deletes the cache entries according to the specified condition. Destroys
-  // this instance of ConditionalCacheDeletionHelper when finished.
-  // Must be called on the IO thread!
-  //
-  // The return value is a net error code. If this method returns
-  // ERR_IO_PENDING, the |completion_callback| will be invoked when the
-  // operation completes.
-  int DeleteAndDestroySelfWhenFinished(
-      const net::CompletionCallback& completion_callback);
-
- private:
-  friend class base::DeleteHelper<ConditionalCacheDeletionHelper>;
-  ~ConditionalCacheDeletionHelper();
-
-  void IterateOverEntries(int error);
-
-  disk_cache::Backend* cache_;
-  const base::Callback<bool(const disk_cache::Entry*)> condition_;
-
-  net::CompletionCallback completion_callback_;
-
-  std::unique_ptr<disk_cache::Backend::Iterator> iterator_;
-  disk_cache::Entry* current_entry_;
-  disk_cache::Entry* previous_entry_;
-
-  DISALLOW_COPY_AND_ASSIGN(ConditionalCacheDeletionHelper);
-};
-
-}  // namespace browsing_data
-
-#endif  // COMPONENTS_BROWSING_DATA_CONDITIONAL_CACHE_DELETION_HELPER_H_