Objects that derive from RefCounted should not have public dtors

content/browser/browser_thread_impl.cc

Index: content/browser/browser_thread_impl.cc
diff --git a/content/browser/browser_thread_impl.cc b/content/browser/browser_thread_impl.cc
index 21b84965796bd6868e62b18751f727ed829769b0..3ca3c846c0a59472b6660865e41d1c1f71712cef 100644
--- a/content/browser/browser_thread_impl.cc
+++ b/content/browser/browser_thread_impl.cc
@@ -214,6 +214,9 @@ class BrowserThreadMessageLoopProxy : public base::MessageLoopProxy {
     return BrowserThread::CurrentlyOn(id_);
   }
 
+ protected:
+  virtual ~BrowserThreadMessageLoopProxy() {}
+
  private:
   BrowserThread::ID id_;
   DISALLOW_COPY_AND_ASSIGN(BrowserThreadMessageLoopProxy);