base::RefCounted now DCHECKs when referenced from multiple threads.

components/url_matcher/url_matcher.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 COMPONENTS_URL_MATCHER_URL_MATCHER_H_
 #define COMPONENTS_URL_MATCHER_URL_MATCHER_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 285 matching lines @@
   static Range CreateRange(int port);
 
  private:
   std::vector<Range> ranges_;
 
   DISALLOW_COPY_AND_ASSIGN(URLMatcherPortFilter);
 };
 
 // This class represents a set of conditions that all need to match on a
 // given URL in order to be considered a match.
+// TODO(mgiuca): Avoid using UnsafeRefCounted. http://crbug.com/469952.
 class URL_MATCHER_EXPORT URLMatcherConditionSet
-    : public base::RefCounted<URLMatcherConditionSet> {
+    : public base::UnsafeRefCounted<URLMatcherConditionSet> {
  public:
   typedef int ID;
   typedef std::set<URLMatcherCondition> Conditions;
   typedef std::set<URLQueryElementMatcherCondition> QueryConditions;
   typedef std::vector<scoped_refptr<URLMatcherConditionSet> > Vector;
 
   // Matches if all conditions in |conditions| are fulfilled.
   URLMatcherConditionSet(ID id, const Conditions& conditions);
 
   // Matches if all conditions in |conditions|, |scheme_filter| and
@@ skipping 18 matching lines @@
   const QueryConditions& query_conditions() const { return query_conditions_; }
 
   bool IsMatch(const std::set<StringPattern::ID>& matching_patterns,
                const GURL& url) const;
 
   bool IsMatch(const std::set<StringPattern::ID>& matching_patterns,
                const GURL& url,
                const std::string& url_for_component_searches) const;
 
  private:
-  friend class base::RefCounted<URLMatcherConditionSet>;
+  friend class base::UnsafeRefCounted<URLMatcherConditionSet>;
   ~URLMatcherConditionSet();
   ID id_;
   Conditions conditions_;
   QueryConditions query_conditions_;
   scoped_ptr<URLMatcherSchemeFilter> scheme_filter_;
   scoped_ptr<URLMatcherPortFilter> port_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(URLMatcherConditionSet);
 };
 
@@ skipping 60 matching lines @@
   RegexSetMatcher origin_and_path_regex_set_matcher_;
   std::set<const StringPattern*> registered_full_url_patterns_;
   std::set<const StringPattern*> registered_url_component_patterns_;
 
   DISALLOW_COPY_AND_ASSIGN(URLMatcher);
 };
 
 }  // namespace url_matcher
 
 #endif  // COMPONENTS_URL_MATCHER_URL_MATCHER_H_