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

extensions/browser/api/cast_channel/logger.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_API_CAST_CHANNEL_LOGGER_H_
 #define EXTENSIONS_BROWSER_API_CAST_CHANNEL_LOGGER_H_
 
 #include <deque>
 #include <map>
 #include <string>
@@ skipping 15 matching lines @@
 namespace cast_channel {
 
 struct AuthResult;
 class CastSocket;
 
 static const int kMaxSocketsToLog = 50;
 static const int kMaxEventsPerSocket = 2000;
 
 // Logs information of each channel and sockets and exports the log as
 // a blob. Logger is done on the IO thread.
-class Logger : public base::RefCounted<Logger> {
+// TODO(mgiuca): Avoid using UnsafeRefCounted. http://crbug.com/469952.
+class Logger : public base::UnsafeRefCounted<Logger> {
  public:
   // |clock|: Clock used for generating timestamps for the events. Owned by
   // this class.
   // |unix_epoch_time_ticks|: The TimeTicks that corresponds to Unix epoch.
   Logger(scoped_ptr<base::TickClock> clock,
          base::TimeTicks unix_epoch_time_ticks);
 
   // For newly created sockets. Will create an event and log a
   // CAST_SOCKET_CREATED event.
   void LogNewSocketEvent(const CastSocket& cast_socket);
@@ skipping 33 matching lines @@
   // Clears the internal map.
   void Reset();
 
   // Returns the last errors logged for |channel_id|.  If the the logs for
   // |channel_id| are evicted before this is called, returns a LastErrors with
   // no errors.  This may happen if errors are logged and retrieved in different
   // tasks.
   LastErrors GetLastErrors(int channel_id) const;
 
  private:
-  friend class base::RefCounted<Logger>;
+  friend class base::UnsafeRefCounted<Logger>;
   ~Logger();
 
   struct AggregatedSocketEventLog {
    public:
     AggregatedSocketEventLog();
     ~AggregatedSocketEventLog();
 
     // Partially constructed AggregatedSocketEvent proto populated by Logger.
     // Contains top level info such as channel ID, IP end point and channel
     // auth type.
@@ skipping 31 matching lines @@
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(Logger);
 };
 }  // namespace cast_channel
 }  // namespace core_api
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_CAST_CHANNEL_LOGGER_H_