Make cast_channel::Logger RefCountedThreadSafe

extensions/browser/api/cast_channel/logger.h

Index: extensions/browser/api/cast_channel/logger.h
diff --git a/extensions/browser/api/cast_channel/logger.h b/extensions/browser/api/cast_channel/logger.h
index 3453f541ce922d9f636ff8efe2b0be187c1f8d94..905ba8b8dc6bb5c24d250464ab0835ade6874b38 100644
--- a/extensions/browser/api/cast_channel/logger.h
+++ b/extensions/browser/api/cast_channel/logger.h
@@ -35,7 +35,7 @@ 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> {
+class Logger : public base::RefCountedThreadSafe<Logger> {
  public:
   // |clock|: Clock used for generating timestamps for the events. Owned by
   // this class.
@@ -92,7 +92,7 @@ class Logger : public base::RefCounted<Logger> {
   LastErrors GetLastErrors(int channel_id) const;
 
  private:
-  friend class base::RefCounted<Logger>;
+  friend class base::RefCountedThreadSafe<Logger>;
   ~Logger();
 
   struct AggregatedSocketEventLog {