Implement rules removal for WebRequestRulesRegistry

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 130 matching lines @@
   URLMatcherCondition CreateURLSuffixCondition(const std::string& suffix);
   URLMatcherCondition CreateURLContainsCondition(const std::string& str);
   URLMatcherCondition CreateURLEqualsCondition(const std::string& str);
 
   // Removes all patterns from |pattern_singletons_| that are not listed in
   // |used_patterns|. These patterns are not referenced any more and get
   // freed.
   void ForgetUnusedPatterns(
       const std::set<SubstringPattern::ID>& used_patterns);
 
+  // Returns true if this object retains no allocated data. Only for debugging.
+  bool IsEmpty() const;
+
  private:
   // Creates a URLMatcherCondition according to the parameters passed.
   // The URLMatcherCondition will refer to a SubstringPattern that is
   // owned by |pattern_singletons_|.
   URLMatcherCondition CreateCondition(URLMatcherCondition::Criterion criterion,
                                       const std::string& pattern);
 
   // Prepends a "." to the hostname if it does not start with one.
   std::string CanonicalizeHostname(const std::string& hostname) const;
 
@@ skipping 65 matching lines @@
 
   // 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_;
   }
 
+  // Returns true if this object retains no allocated data. Only for debugging.
+  bool IsEmpty() const;
+
  private:
   void UpdateSubstringSetMatcher(bool full_url_conditions);
   void UpdateTriggers();
   void UpdateConditionFactory();
   void UpdateInternalDatastructures();
 
   URLMatcherConditionFactory condition_factory_;
 
   // Maps the ID of a URLMatcherConditionSet to the respective
   // URLMatcherConditionSet.
@@ skipping 10 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_