Implementation of beginning of Declarative Web Request API backend

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

 // 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.
 
 #include "chrome/browser/extensions/api/declarative/url_matcher.h"
 
 #include <algorithm>
 #include <iterator>
 
 #include "base/logging.h"
@@ skipping 427 matching lines @@
     const std::vector<URLMatcherConditionSet::ID>& condition_set_ids) {
   for (std::vector<URLMatcherConditionSet::ID>::const_iterator i =
       condition_set_ids.begin(); i != condition_set_ids.end(); ++i) {
     DCHECK(url_matcher_condition_sets_.find(*i) !=
         url_matcher_condition_sets_.end());
     url_matcher_condition_sets_.erase(*i);
   }
   UpdateInternalDatastructures();
 }
 
+void URLMatcher::ClearUnusedConditionSets() {
+  UpdateConditionFactory();
+}
+
 std::set<URLMatcherConditionSet::ID> URLMatcher::MatchURL(const GURL& url) {
   // Find all IDs of SubstringPatterns that match |url|.
   // See URLMatcherConditionFactory for the canonicalization of URLs and the
   // distinction between full url searches and url component searches.
   std::set<SubstringPattern::ID> matches;
   full_url_matcher_.Match(
       condition_factory_.CanonicalizeURLForFullSearches(url), &matches);
   url_component_matcher_.Match(
       condition_factory_.CanonicalizeURLForComponentSearches(url), &matches);
 
@@ skipping 142 matching lines @@
 }
 
 void URLMatcher::UpdateInternalDatastructures() {
   UpdateSubstringSetMatcher(false);
   UpdateSubstringSetMatcher(true);
   UpdateTriggers();
   UpdateConditionFactory();
 }
 
 }  // namespace extensions