Implementation of beginning of Declarative Web Request API backend

chrome/browser/extensions/api/declarative/url_matcher.h

 // Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_URL_MATCHER_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_URL_MATCHER_H_
 #pragma once
 
 #include <set>
 #include <vector>
@@ skipping 203 matching lines @@
   // times with a single condition set in each call.
   void AddConditionSets(
       const std::vector<URLMatcherConditionSet>& condition_sets);
 
   // Removes the listed condition sets. All |condition_set_ids| must be
   // currently registered. This function should be called with large batches
   // of |condition_set_ids| at a time to improve performance.
   void RemoveConditionSets(
       const std::vector<URLMatcherConditionSet::ID>& condition_set_ids);
 
+  // Removes all unused condition sets from the ConditionFactory.
+  void ClearUnusedConditionSets();
+
   // Returns the IDs of all URLMatcherConditionSet that match to this |url|.
   std::set<URLMatcherConditionSet::ID> MatchURL(const GURL& url);
 
   // Returns the URLMatcherConditionFactory that must be used to create
   // URLMatcherConditionSets for this URLMatcher.
   URLMatcherConditionFactory* condition_factory() {
     return &condition_factory_;
   }
 
  private:
@@ skipping 19 matching lines @@
   SubstringSetMatcher url_component_matcher_;
   std::set<const SubstringPattern*> registered_full_url_patterns_;
   std::set<const SubstringPattern*> registered_url_component_patterns_;
 
   DISALLOW_COPY_AND_ASSIGN(URLMatcher);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_URL_MATCHER_H_